How can I programmatically send a GSM request via a 3G modem and get a response for further processing?

Question

API

I need to automate a process that is done manually on a mobile phone, for example:
- I send a GSM code: *123#
- I get a response that says that you can select several options.
- I send the number of the second option: 2
- I get a response describing the input of further data
- etc.....
How can such a process be automated?

Answer 1

What you are talking about is called a USSD request. Of course, you can send it using a 3G modem. Read manuals on AT commands, in particular AT+CUSD .