My phone was purchased "factory unlocked" and for the past year has been used in Mexico. 4 days ago I changed carriers to ATT and that seems to be when the problem started.
IOS is 6.1.3
I set it up as a new phone after restoring. It works perfectly with 4g.
Dustin, I do not have a backup prior to ATT on my computer. At the same time I changed carriers to ATT I also purchased a iphone 5 which I backed up from my computer.
I don't know if this helps, but bluetooth will not connect either, maybe because of no wifi, however, I also attempted to connect bluetooth through 4g and it would not connect.
No problem whatsoever. The iphone 5 started with a new sim card etc. where the 4s sim was removed and replaced with ATT sim.
In rare instances, the setting to turn on Wi-Fi on your iPhone, iPad, or iPod touch may appear "grayed out" or dim. If this occurs, you will not be able to turn Wi-Fi on. You may see the following:
Follow these steps to resolve the issue:
If you are still unable to turn Wi-Fi on, please contact Apple for support and service options.