My wife just received an iPhone 5 (we are new to the IOS universe) and it is running IOS 6.1.4 and she has her phone backing up daily to iCloud. This week she is going to port her old wireless number to the iPhone. I understand the iPhone has to be wiped in order to change the phone number, correct? So with her phone reset and max storage available, should she upgrade then to IOS 7 and then restore her backup from iCloud? Would that work ok?
First of all, I have never heard that you had to wipe a phone in order to change the phone number. Where did that information come from? I’d be interested in seeing that documented, as I have never heard/seen/read that anywhere.
Certainly she can back up her phone, wipe it and install iOS 7, then restore from the backup... but not sure why she would do that - especially in light of my suspicion about the previous statement.
The easiest option should be to go to Settings > General > Software Update on her phone, and just do the iOS 7 update OTA (over the air). The only requirements for that would be to be connected to a wifi network, and have a full battery charge (or have the phone plugged into a charger).