Editor? 2020-02-07
China Mobile Complaints Acceptance
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The official phone asks TA for official services.
Method 1:
Turn on the phone and select "System Settings Icon".
After entering the setting interface, select "Dual Card and Network", because my mobile phone supports dual cards, so there is this option here, and mobile phones that do not support dual cards choose "Network".
After entering the options, click "Network Mode".
In the pop-up dialog box, you can switch network standards, and click to complete the switch.
Method 2:
On the main interface of the mobile phone, slide down the screen to bring up the notification bar.
After entering the notification bar, click the "Network Mode" icon and select the following network standard.
Network standard is the type of network. The frequency bands commonly used in domestic mobile phones mainly include CDMA 1X and 800MHZ frequency band occupied by CDMA mobile phones. 900/ 1800/ 1900MHZ frequency band occupied by GSM mobile phones; 900/ 1800MHZ frequency band occupied by GSM 1X dual mode in recent two years; The 900/1800/1900/2100 MHz band occupied by 3G.
When it comes to the frequency bands supported by mobile phones, we must first make it clear that frequency bands are difficult to divide in nature, mainly because of frequency information. Due to limited resources, the Ministry of Information Industry is mainly responsible for related matters in China.
Network standard (5) GSM (2g)/TD-SCDMA (3g)/TD-LTE (4g) currently used by China Mobile;
China Unicom uses GSM (2g)/WCDMA (3g)/TD-LTE (4g)/FDD-LTE (4g);
And China Telecom uses CDMA? 1X(2G)/EVDO(3G)/TD-LTE(4G)/FDD-LTE(4G).
For domestic operators, as long as they reach seven modes, namely GSM/TD-SCDMA/WCDMA/TD-LTE/FDD-LTE/CDMA? 1X/EVDO is a full netcom model, and this model can even be called GSM.