Android Check if call forwarding is activated

Question

I am building a call forwarding application and have used the **21*xxxxxx# ussd code to activate call fowarding using ACTION_CALL Intent. But I have not found a solution to

Answer 1

PRECAUTION: The following answer is suggestion. I haven't tried it personally So you better try it to check the result.

From your gsm number you can check your call forwarding options by dialing *#21#. So you can try dialing this number from application and read the ussd response.

part 1: to dial the number

Intent intentCallForward = new Intent(Intent.ACTION_CALL);                               
Uri uri = Uri.fromParts("tel", "*#21#", "#"); 
intentCallForward.setData(uri);                                
startActivity(intentCallForward);

part 2: to read the ussd response

There is no API to do this. But here in this SO answer it suggested some methods that you can try.

Best of luck