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

yes you can use *#21# to check for CF in the same way as you used **21*xxxxxx# to activate CF. BTW, these are MMI code, not USSD code.