Apparently, if you unlock your iPhone, you lose voicemail functionality. Now you can have it back via one simple step.
Open the Phone app and hit the keypad button. Then you just type in the following: *5005*86*phonenumber#.

Take the period off the end of that, and replace phonenumber with the number you call to get to your voicemail, and then hit the call button with all that typed in. Then viola! its fixed, and the balance is restored to the universe.
Unlocked iPhones: How to re-enable voicemail [via iphoneatlas]








Anyone know how to get the voicemail button back to normal after doing that?
THANK YOU!!!! WORKED PERFECTLY!!!
I have unlocked iPhone 3g with t-mobile and I would like my voicemail back on there like it was with AT&T.is there anything I can do.