Settings > Phone > My Number > Unknown
Updated wife's iPhone 4 to iOS 5.0.1 and
Settings > Phone > My Number
shows UNKNOWN.
I assume this prevents imessages and sms messages from working because they are not going through, unless she has wifi signal.
She does not have 3g service so if she wanted to send an iMessaage without wifi signal, the phone should automatically switch to sms... and it doesn't.
All messaging settings are on: iMesages and Send as SMS.
I tried my sim from my iPhone 4 on 5.0.1 on her phone and get UNKNOWN number as well.
Tried her sim on my phone and her number shows. So it's definitely an issue with her phone.
Any ideas how to fix this.