Gives busy signal rather than voicemail
Hi I'm having a problem with my iphone 3g... my visual voicemail works fine, I can see it and can hear my greeting. The problem is when a friend calls me, if i ignore the call or don't pick it up, it will give them a busy signal rather than my voicemail. Having a voicemail is very important for my work so this is a real pain. If anyone has any suggestions to fix it, I'd really appreciate it.
hp, Windows XP