I want to Send AT Command to Android phone.

I know SDK does not support this.

but there are two solution :

  1. change the code of Kernel and release your new Android (it seems it is so hard!)

  2. LoopBack on USB.(i think Bluetooth is same)

About second solution , when you connect your phone to PC with USB cable , you will see a GSM modem on Device Manager that help you to send AT Command to GSM Modem.

If we find a solution to loop back on mobile phone , we can send AT commands to GSM Modem.

Question is : HOW to loop back and what tty file on kernel will help us?

android at-command
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