The easiest way to deal with it is to find the patent office.
First of all, functional ideas on mobile phones can generally be patented, but they should also be analyzed in detail. Generally speaking, you have passed the application for invention patent, but in fact, there are many unprotected subjects in China's invention patent, so it depends on the specific content of your creativity.
How to apply, of course, is to submit the application documents to the patent office, but the application documents are the main content of your patent, so don't write them yourself, and the consequences will be very serious.
This is the case all over the world. If you apply for a patent in that country, it can only be valid in that country. Therefore, an application in China can only be valid in China. If you want to apply for a patent in America, you can apply in America.
In China, patent protection has a certain effect, but it needs specific analysis.
To apply for American patents, priority is generally claimed on the basis of China patents, and then American patents are applied. Pay attention to choosing a certain number of patent offices.