hey how to make a mobile phone?
don't scam
Answers
Explanation:
I would say if serious about making a mobile phone then DON’T start off with Arduino/RasperryPi/whatever first because you will almost certainly become sidetracked and lose focus if you haven’t used them before. Take it from me, I have seen through so many designs starting from blank sheet /adaptations of existing that I lost count decades ago.
Instead start off with the CORE of the mobile phone first, the GSM modem, use it straight away to send and receive SMS, make calls and connect to the internet. You only need a computer with a USB serial interface (about a dollar US). You can get one and the modem off Amazon or Ebay very cheap. Whatever modem is most popular.
If you are lucky enough to be in a part of the world that still use 2G you can even buy a modem for as little as 50 cents USD! as in this modem example here. The UK and Spain do most definately support 2G.
You can write a script to run on the computer to get the modem to make calls, send texts and upload files to a FTP server etc. There’s masses of help published on the Internet for AT+ commands and also simulators to test your scripts without any hardware. Some people have also hacked older mobile phones by connecting up to them and spying on the phone’s modem AT & AT+ commands to get their ideas. Different phone brands have their own favorite ways. You’ll start to see the overall personality of a phone is influenced a lot about what the modem offers.
Then when you know what you want the modem to do then you can introduce a Ardudino/ARM/Pi or whatever, or just a bare microcontroller.
A mobile phone just for receiving calls doesn’t need to have a LCD + touchscreen, just a single button. Can be whatever you want it to be. It could have 3 months standby time, can have a 12 inch LCD screen with separate wireless keyboard. And always based on a standard GSM modem that does most of the leg work.
Footnotes