I was not able to locate any known issue with this feature. If this support page does not help and the link for setting up google voice that Levi provided you should contact a Sprint Technician. Let me know if any of this information below helps.
There are three types of Conditional Call Forwarding you can choose from:
- Busy – Only sends calls to an alternate number if you have two calls active at the same time (e.g. you are on a call and have a call waiting)
- No Answer – Only sends calls to an alternate number if you don't answer your phone
- Busy/No Answer – Will send a call to an alternate number for either condition listed above
Note: You may forward your calls to two different numbers for Conditional Call Forwarding by simply completing both steps 1 and 2 below. You can forward calls to one number when your mobile number is busy, and a different number if you do not answer.
Setup instructions and Star (*) codes for managing each type of conditional call forward are listed below:
- Busy (*74/*740)
- Turn on just Conditional Call Forward - Busy
- Dial *74 plus the 10-digit number you are forwarding your calls to (e.g. *555-555-5555).
- Press Talk.
- You should hear tones, then the call will disconnect. Your calls will now forward to the 10- digit number you entered for when your mobile number is busy.
- Turn off Conditional Call Forward - Busy
- Dial *740
- Press Talk
- You should hear tones, then the call will disconnect. All your calls will begin ringing on your phone again.
- No Answer (*73/*730)
- Turn on just Conditional Call Forward - No Answer
- Dial *73 plus the 10-digit number you are forwarding your calls to (e.g. *555-555-5555).
- Press Talk.
- You should hear tones, then the call will disconnect. Your calls will now forward to the 10-digit number you entered when you do not answer your phone.
- Turn off conditional Call Forward - No Answer
- Dial *730.
- Press Talk.
- You should hear tones, then the call will disconnect. All your calls will begin ringing on your phone again.
- Busy/No Answer (*28/*38)
- Turn on BOTH Conditional Call Forward - Busy and No Answer
- Dial *28 plus the 10-digit number you are forwarding your calls to (e.g. *555-555-5555)
- Press Talk.
- You should hear tones, then the call will disconnect. Your calls will now forward to the 10-digit number you entered when your mobile number is busy or you do not answer your phone.
- Turn off Conditional Call Forward - Busy and No Answer
- Dial *38.
- Press Talk.
- You should hear tones, then the call will disconnect. All your calls will begin ringing on your phone again.
