Mobile phone is the abbreviation of portable phone, or mobile phone, which is also called mobile phone in Hong Kong. This is a portable wireless phone.
1one day in April, 973, a man stood on the street of new york, took out a wireless phone about the size of two bricks and made a call, which attracted passers-by to stop and stare. This man is marty cooper, the inventor of mobile phone. At that time, Cooper was an engineer of the famous Motorola company in the United States.
The first mobile phone in the world was called to an opponent who worked in Bell Laboratories in Alexandria. At that time, the other party was also developing mobile phones, but it has not been successful. Cooper later recalled: "I called him and said,' Joe, I'm talking to you on my mobile phone.' I heard the voice of "gnashing my teeth" on the other end of the phone-although he has always been quite polite. "
This product of the competition of scientific and technological personnel in those days has blossomed everywhere now, which has brought great convenience to our modern life.
Marty cooper is 74 years old. After working in Motorola for 29 years, he founded his own communication technology research company in Silicon Valley. He is currently the chairman and CEO of this company. Marty cooper's idea at that time was to let the media know that wireless communication, especially small mobile phones, was very valuable. In addition, he also hopes to arouse the interest of the Federal Communications Commission, and AT & amp； t(AT & amp； T is also a big communication company in the United States) and can support the former.
In fact, going back, we will find that the concept of mobile phone appeared as early as 1940s. At that time, the trial production was started by alexander bell Laboratory, the largest communication company in the United States. 1946, alexander bell laboratory made the first so-called mobile phone. But because of its large size, researchers can only put it on the shelf in the laboratory, and people will gradually forget it.
Until the end of 1960s, in&; Two companies, T and Motorola, became interested in this technology. At that time, at & amp； T Rent a large mobile radiotelephone, which customers can install on the truck. At&T Company. T's vision is to develop a mobile phone with the power of 10 watt in the future, and use the radio equipment on the truck to communicate. Cooper thinks this kind of mobile phone is too big and heavy to move and carry. Therefore, Motorola filed an application with the Federal Communications Commission, requesting that the power of mobile communication equipment can only be one watt, and the maximum power cannot exceed three watts. In fact, the maximum radio power of most mobile phones today is only 500 MW.
From 1973 to 1985, the first modern mobile phone was born. Is to combine the power supply and antenna into one
But now the functions of mobile phones are getting wider and wider, and the main functions are different for different people!
For college students, even those with mobile phones, texting is the most important function. Some people only pay attention to the SMS function when buying mobile phones! Send jokes, harassment, love letters and so on!
However, for business people, the latest business stealth mobile phone is their first choice, which can provide powerful security functions and prevent the loss of important information (which may cause serious losses).
But for the average person, the function of calling in time is the most important!
Of course, some additional functions now are also promising! 30-1.3-2 million pixel mobile phones have become the favorite of many young people, and you can take wonderful moments when some unexpected events come or exciting moments!
Of course there are others, such as e-books!
Matters needing attention when buying a mobile phone
First, choose a brand.
At present, there are many domestic and foreign mobile phone brands approved for sale by the national radio management department. Consumers mainly consider the reputation of brand mobile phone manufacturers, after-sales service, mobile phone quality and whether related accessories are easy to buy.
Second, choose a good place to buy.
Now there are mobile phone counters everywhere. Whose home do consumers buy? At present, people can generally buy mobile phones through factory stores, telecom business halls, large and medium-sized shopping malls and general retail stores. Shopkeepers have the deepest understanding of manufacturers' products and complete accessories. After-sales service is not only direct, but also perfect and thoughtful. Buying in the business hall of China Telecom or China Unicom is relatively safe, with regular purchase channels and strong after-sales service technology, but the price is relatively expensive. Buying in large and medium-sized shopping malls is equally assured, with formal purchase channels and after-sales quality guarantee clauses. To buy in a general retail store, we must first confirm whether the store has a Mobile Communication Terminal Distribution License issued by the local telecommunications industry management department and a Sales License issued by the radio management department. Generally, the prices of retail stores are relatively low, but pay attention to their mobile phone configuration and after-sales service when buying.
Third, compare functions and choose appearance.
The more functions, the better. In fact, many functions are not needed at all. We should measure our own needs and compare them. Choose a mobile phone with simple operation and humanized design, which is very convenient to use in the future. For ordinary consumers, Chinese short message function is more practical. Consumers should pay special attention to whether the SMS input method is easy to use when purchasing. This seemingly simple function is actually very different between different mobile phones. The shape of the mobile phone should be reasonable, the appearance color should conform to the personality and occupation of the owner, and it should be easy to operate with one hand.
Fourth, the price
Usually wool comes from sheep, with complete functions, color screen and camera, small size and long standby time. Usually, everyone wants a mobile phone, but the price of a mobile phone that meets these conditions is also more expensive than that of a general mobile phone. Price is the most concerned indicator for buyers. For the same model, the prices of telecom business halls, manufacturers and general retail stores may be different. Please note when the price is low:
1. All distributed mobile phones must have the "network access license" of the Ministry of Posts and Telecommunications and the anti-counterfeiting mark, and the anti-counterfeiting mark will display the clear pink word "CMII" under the fluorescence of the money detector.
2. Pay attention to batteries at different price points at the same time. Whether the type and quantity of accessories are the same as the standard configuration of the manufacturer's franchise stores, whether the batteries and accessories are original from the manufacturer, and whether the distributor has quality assurance or corresponding written warranty commitment.
3. Enter "*#06#" on the mobile phone to see if the IMEI number displayed on the screen of the mobile phone matches the IMEI number on the back of the mobile phone (you can see it after taking out the battery), the IMEI number on the box of the mobile phone and the IMEI number on the yellow sticker, so as to judge whether the mobile phone motherboard has been replaced.
Fifth, check the phone.
Configuration: battery, charger and earphone check whether the mobile phone packaging box has Chinese logo and is beautifully printed; Whether there are original Chinese instructions, original certificate and original battery; Whether the types and quantities of accessories such as fast chargers and charging stands are complete, whether they are made by manufacturers, and whether the power plugs meet Chinese standards.
The original high-end mobile phone battery is worth more than several hundred yuan, while the counterfeit battery is less than 100 yuan. Forced charging with fake batteries may cause explosion, so be sure to check it carefully.
Six, check the after-sales maintenance service
Be sure to carefully check whether the original factory or its authorized special maintenance center provides one-year warranty and lifelong maintenance service. Seek the guarantee of regular agents to avoid having no recourse after buying parallel imports.
Study on the harm of machine radiation to human body
Background: In this era of rapid development of information technology, mobile phones have become more and more popular, but new problems have also emerged. How harmful mobile phone radiation is to human body has become a cross-century unsolved case, and no one can give a clear statement so far. Everyone knows that smoking is harmful to health, but there are still some people who are restless. When mobile communication has become the dependence of more and more people like cigarettes, people have fallen into a dilemma between health and convenience. However, the difference between mobile phones and cigarettes lies in where the danger lies, and people are still arguing ambitiously about where the danger lurks. This makes merchants always hang a sword on their heads, not knowing whether to drop it or remove it, which makes consumers panic. Known injuries can be prevented, and unknown fears are as worrying as the protagonist in The Man in the Condom. The harm of mobile phone to human body is imminent, because it is related to our health and the future development of mobile phone.
Research process: 1. Discuss research methods.
2. Search for relevant information online.
3. Collate the obtained data.
4. Summarize and write the paper.
Research results: Electromagnetic radiation from mobile phones can cause neurasthenia, loss of appetite, loss of libido, palpitation, chest tightness, dizziness, listlessness and other diseases, and may even induce brain tumors. Mobile phone users are more likely to die of brain cancer, and the chances of suffering from extra-brain tumors are doubled. Endangering fertility and causing fetal malformation. Frequent use of mobile phones can make people aging, just as people who smoke often age quickly. Low-level radiation from mobile phones will accelerate cell activity. Medical circles believe that tumors, heart diseases and Alzheimer's disease are all caused by radiation. When cells are affected, the biological defense system will be activated, and protein will be produced to "attach" to cells to protect and repair them. However, for heavy users of mobile phones, too much protein will "stick" to cells and hinder natural patching. Cells will slowly fail to function normally, and metabolism will become slow. If the cell repair activity is excessive, premature aging will occur.
Example 1: The researchers also conducted a mobile phone volunteer experiment in the Royal British Hospital. They were connected to a transmitter in the head, and within an hour, half of them received the microwave from the 9 15 MHz mobile phone, and the other half didn't. Followed by psychological tests to determine the affected brain. The results show that the memory and attention of a group of people who have not received microwave radiation are better or the same as before, while those who have received microwave radiation are generally worse than before.
Example 2: An expert who specializes in mobile phones at the University of Washington in the United States once experimented with mice. Put a hundred mice in a big bucket full of water, put a life-saving floating platform in the water, and then train these mice to climb the life-saving floating platform. In order to keep the knowledge of climbing the floating platform in the long-term memory of the mice, he trained the mice six times repeatedly. The expert exposed 50 mice to microwave radiation similar to mobile phones, and found that the other 50 mice that were not exposed to microwave radiation could still get out of the water easily. However, the mice affected by microwave almost lost their memory and didn't know how to climb the floating platform.
Status quo: To sum up, the harm of mobile phone radiation is very terrible. However, we can avoid it.
Methods 1: Reduce the use of mobile phones. Method 2: Use a hands-free mobile phone to avoid the phone touching the ear.
Attachment: In addition, Japanese scientists have developed a coating, which can be applied to the shell of mobile phones by treating the shell of shellfish in the ocean to reduce or reduce the electromagnetic radiation of mobile phones. The administrative departments of some countries have also set up special institutions to study the influence of mobile phones on human health, so as to take corresponding measures. It is believed that with the development of modern science and technology, people will find safe and convenient new methods and technologies to reduce the electromagnetic radiation of mobile phones and make them better serve modern human life and communication.
Mainland licensed goods (Line A): those mainly produced in China and sold in China market are called mainland goods. All licensed machines in Chinese mainland can get free warranty service in the customer service center. In some areas, the purchase invoice must be presented, and Nokia Continental Bank can not repair the invoice warranty. Sony Ericsson can insure without invoice, but only once. Sony Ericsson has a copy of the invoice, which can be guaranteed many times, but there is no original. Mainland licensed machines all have network access licenses. Certificates can be displayed under purple light.
2. Mainland licensed products (line B): Generally, it refers to changing the serial number of machine writing software in Hong Kong into mainland licensed products, and most machines can enjoy nationwide warranty.
3. Hong Kong licensed goods: mainly imported from Hong Kong and sold in Hong Kong, which is guaranteed. Now Nokia and Motorola's Hong Kong banks can guarantee in Chinese mainland (but the original Hong Kong invoice is required). If not, it can only be guaranteed in Hong Kong. There are simplified Chinese and traditional Chinese.
Four. Machinery for Australia: mainly from Macao, imported in large quantities. The warranty sold in Macao cannot be guaranteed together with the original goods in Hong Kong. Now Nokia Australia can also be guaranteed in Chinese mainland, generally called Hong Kong Bank (but the original invoice is required), but in Chinese mainland, as long as there is a national warranty label of Nokia Supreme Store, it can be guaranteed. If not, it can only be guaranteed in Macao. There are simplified Chinese and traditional Chinese.
5. Original parallel imports (European version machine, parallel imports): There is no warranty in Hong Kong mainland, but it is sold in Europe, so it is called Eurowater. Generally, English versions are changed to Chinese, so some of them are called Ou Shui. Generally, the keys have no Chinese strokes, and the instructions and packages are in English, and most of them are input in simplified Chinese.
Note: Parallel cargo plane does not mean water inlet machine, and different sales areas do not mean that there is a problem with machine performance.
6. Refurbishment machine: that is, the second mobile phone is replaced with a shell and a package, and parallel imports can be replaced with new ones. Some parallel imports are licensed, and the renovation of licensed products is not guaranteed. They are all parallel imports, refurbished or mainly sold as new machines. Now all the people who do decoration are more professional. Generally, the original shell and original accessories are used, but there is no original goods for packaging. So most of them are assembled, the process is rough, and the paper in the manual is not as good as the original one. Renovation is mainly supplied to the new machine market. The refurbished ones are only sold at a loss and will not be sold as second-hand mobile phones. Therefore, players who buy new machines should pay more attention, mainly not to be greedy and cheap. Because there is a big price difference between refurbished machines and brand-new machines, it is easy to attract players who want to buy new machines cheaply.
Seven, charger: charger is mainly used for a short time, you can't see that it has been used, and some licensed products still have a warranty. The mainframe and accessories are all original, and there are licensed parallel imports, and the price is relatively cheap. I really don't know whether selling such a machine is a good thing or a bad thing. It is best not to tell yourself, so the psychology will be more parallel.
8. Splicing machine: Splicing machine is also called assembly machine and parallel installation machine. Mainly based on parallel assembly, because it is generally bought in a small factory and assembled into a finished machine. That's why it's called a trigger. It's a big quality problem. Because in the production process, generally speaking, parts without sound function will not be installed in the machine. (For example, 83 10 only has a base frequency of 900Hz, and there are no high frequencies such as 1800Hz, 76 10, 66 10, 6 100. ) Generally, the trigger only returns to production for machines that sell well, because they can afford it. (For example: 82 10, 8250, 83 10, 72 10, 7250, 66 10, 6 100, T6 18. Similarly, the board is only for second-hand sellers, and players who buy new machines don't need to worry about not buying triggers.
Revision machine: Revision machine is equal to women disguised as men, such as T6 18 to T628, 82 10 to 8250. The main reason is that the same motherboard is easy to transform. Mainly use the revision machine. You will only be scolded to death if you buy a new machine. So friends who buy a new machine don't have to worry about buying a revision machine.
Tips: The mobile phone market is extremely complicated, and refurbished machines, chargers and trigger machines can be seen everywhere. I solemnly remind every customer that besides paying attention to the price, please pay more attention to what kind of machine you bought!
What is the secret of ★ 14?
In foreign countries, such as Europe and North America, network operators have such a service: you only need to open a number in the network, sign a usage agreement, pay a certain phone bill every month, pay enough for two years, and give this mobile phone a trial period of 14 days. If you feel dissatisfied, you can cancel the agreement and return the mobile phone to the network operator. This is a bit similar to the prepaid phone charges launched by China Mobile and China Unicom. The difference is that foreign services are more humanized, and there can be a "probation period 14 days". If you are not satisfied with it, you can change to another model at will within 14 days. It's up to you whether to use this network or not. All you have is this 14 day machine. The machine has good color, and the product color is 97~ 100%. It's new and has a full set of original accessories.
★ The difference between parallel imports and licensed products:
1. First of all, it is certain that parallel imports and licensed products are produced by regular manufacturers. Parallel imports do not mean that products are mixed with water. Don't treat parallel imports as fakes. At present, the technical integration of mobile phones is not backward enough for people to copy, unless it is OEM products, such as Kejian and Samsung, Lenovo and LG, Shouxin and Nokia, etc., but it is also a formal transfer of property rights. Therefore, there is no essential difference between parallel imports and licensed products. You don't have to look at parallel imports very badly.
2. So what's the difference between parallel imports and licensed products? The answer mainly lies in the different differences in regional sales and services. The so-called concept of parallel imports is only a regional sales concept, or you can roughly and mainly regard it as a service concept accompanying regional sales, rather than an essential concept. In fact, at the time of purchase, we can see that a valuable service of the manufacturer is virtually tied up in the branch company in the product sales area. Whether it is necessary or not, the cost is different.
★ Is the parallel plane a refurbished machine?
Generally speaking, parallel imports are things that have not entered the China market through formal customs declaration, but most of them are new machines (except 14 model and second mobile phone). Because machines in foreign markets are cheaper than those in China, especially because of the time lag between domestic and foreign new products and the fact that machines listed in the mainland are not sold well for various reasons, many unscrupulous businessmen take risks to get them back and earn a huge price difference, which is huge (a lot).
However, most parallel planes are absolutely brand-new (except foreign garbage). When they enter the shore, they are just like computer parts. Recently, they are rarely packed (except for Asia-Pacific ports) to ensure brand-new.
★ What is the reason for the poor packaging and mismatch of parallel imports?
As mentioned above, most of the parallel imports come from Logger Vick, and the accessories are all made in China (licensed products are basically made in China). Some merchants will be equipped with authorized packaging, manuals, chargers, data cables and CDs. Such as Samsung and Motorola. These machines may have original accessories, so there is nothing to say. As for Hong Kong banks, theoretically they should all be all-inclusive. But most other parallel imports and accessories can't be original, such as box instructions. Which merchant would be stupid enough to take such a big risk to smuggle these worthless things back (of course, occasionally)? This is just a battery on the top of the machine. Therefore, it is normal to pirate boxes, manuals and even assemble chargers, especially some machines that are not listed on the mainland. As for the phone number and box, it is more normal. The box is domestic and the mobile phone is foreign. How to check the number?
However, most of the batteries of parallel mobile phones should be original, unless some models really have little original electricity and can't be found. Some enterprises rely on batteries to make profits and use group electricity instead. Generally, the original power is more than thirty or forty, especially the batteries of Samsung and Sony are expensive. Electricity is only tens of dollars, so be sure to say hello before you buy it.
★ Is the quality of parallel imports worse than that of licensed products? Is the quality of parallel imports better than that of licensed products?
Both of these statements are wrong. As far as the mobile phone itself is concerned, no matter how many parallel products are licensed and there is no perfect machine, some problems will inevitably occur. It is meaningless to say that the quality of parallel imports is poor.
In fact, a considerable number of Hong Kong banks and Asia-Pacific aircraft, especially Samsung and Moto, are basically made in China, which are exactly the same as the licensed products, but the packaging is different or the inscriptions on them are different, which is far from poor quality or good quality, and only depends on individual differences.
A considerable part of the poor quality of parallel imports refers to software problems, and the hardware is absolutely fine. Some mobile phones can't brush licensed software (in the past, the memory of parallel planes was small, and Chinese characters accounted for two bytes), so they had to change them themselves. Some experts rewritten the software or something. From the immaturity before to the maturity now, generally speaking, most of the rewritten software has no problem, and a few are unstable, which is prone to screen display, crash and screen display error.
To say that parallel imports are of good quality is nothing more than saying that parallel imports are made abroad and their workmanship is better than domestic ones. This is also untenable. There are indeed some machines made in Finland, such as Nokia. The quality of the machine is good, but it is not absolute. There is no reason to say that domestic production technology must be worse than foreign countries. Why not just set up factories in China for Intel and Samsung? You don't have to sell yourself short. Many electronic products labeled with foreign products are simply assembled and produced in China, and then go out to become imported products to cheat money (such as Sennheiser). Of course, this is a normal phenomenon of market and production needs.
★ The truth about Taiwan Province and South Korea?
The tag machines in Taiwan Province and South Korea are often called Taiwanese machine, Korean machine, miscellaneous brand machine and tag machine. This kind of machine should be of another type than a straight line. Most of these machines are produced by small factories in Korea or Taiwan Province Province. Generally, the machines are original from South Korea or Taiwan Province Province, and 98% of the accessories are manufactured by a third-party manufacturer in Shenzhen, so the packaging is more casual. But one feature is that the packaging of this machine is very strong!
The quality of the main engine of this machine is equivalent to that of most domestic machines. It turns out that most domestic machines are OEM and OEM machines. The quality of such machines can never be compared with big-name manufacturers such as Samsung, Nokia, MOTO and Sony Ericsson. To put it simply, there may be problems with five Nokia machines with 100. These five problems can generally be fixed at one time, and there will be no more failures after repair. Of this 100 machine, 20 may have problems to be repaired, of which 5 often recur after being repaired and 5 cannot be repaired well.
98% of the accessories of this machine are OEM by domestic manufacturers, and the quality of all accessories is equivalent to the assembled fire cows and batteries we usually see in 20 yuan. Fortunately, most of these machines provide replacement parts. (But the accessories can't be worn out, and there are also headaches. )
The biggest advantage of this kind of machines is that they are cheap and most of them are novel in appearance. Now the best-selling Tiankuo K889 is almost exactly the same in appearance as Samsung E700, and its functions are more powerful than E700, especially supporting MP3 playback, but its price is cheaper than Samsung E700 in 500 yuan. Therefore, the key to attract people to buy this kind of machine is cheap, the appearance, ringtone and screen configuration are not bad, and usually this kind of machine has ringtones sung by real people.
Summary: 1, if you want to be cheap, investigate the more popular fashion appearance, ringtones and pictures. As well as the satisfaction of basic call functions, you can choose this machine.
2. If you want to pursue perfection, you can't stand the disconnection and disconnection of any telephone. Be sure to use GPRS and MMS, and don't choose this machine.
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