Which number should PHS send to change the color ring back tone?

Dear telecom users, hello! You can edit 1000 1 to 100 1 to modify it gradually. You can also log in to the telecom network lobby management, log in with your mobile phone number and password on the home page, and then manage the color ring back tone:

If you need to check the bill and pay the phone bill, please go to the online business hall of Anhui Telecom. Wish you a happy life!