'Call Forwarding Active' message

[vitaminz]

Hi, I use an unlocked iPhone 3G on the '3' UK network, and I have a little annoyance with placing phone calls.

Whenever I place a call, it comes up saying 'Call Forwarding Active' and I have to Dismiss it. I've had my iPhone for a year and it hasn't affected any incoming calls/outgoing calls or anything, but none of my friends get it on their iPhone's and it's bugging me

What does it even mean? And how can I stop it popping up?

 

[jlamb0]

Did you link your iPhone with Google Voice, by any chance?

I've been having the same issue! (I'm in the U.S. on AT&T).

I'm not unlocked, but I was jailbroken until a minute ago. I just restored to factory settings and I'm still getting the message whenever I make a call.