I recently upgraded my iPhone 3g to IOS 5. Since the upgrade I have a problem when I forward my home phone to the cell phone. I someone tries to call my home phone after it has been forwarded to my cell they get a busy signal or a message that this phone number is not accepting calls. I can successfully forward the home phone to my wife's Blackberry. Had a friend come over with an iPhone 4S and was able to duplicate the problem.