Hi so I just recently got a new iPhone 3G from the Apple store because the casing on my other one was cracking. However now I have a new problem. My phone keeps bringing up this ivalid password for voicemail and keeps asking me to enter my password. The problem is I never even set password for my voicemail what should I do should I try and erase everything and then get all my information from backup? Idk any help would be very much appreciated.