Fix iPhone cellular data problems by resetting network settings
I love my iPhone but it’s had it’s share of quirks, and one of them is the seemingly random ability to access the cellular data network. I don’t know if this is an AT&T problem or an iPhone problem, but it’s really annoying to not be able to use 3G service when I need to. I went looking for a solution for the problem and came across a pretty simple and straightforward fix on TUAW. They suggest resetting your iPhone Network Settings:
To reset your iPhone’s network settings, tap your way to Settings > General > Reset > Reset Network Settings.
The only downside to this solution is that it also resets your remembered WiFi access points and their passwords, so be ready to re-enter a bunch of WEP/WPA keys!
Anyway, this solution worked for me, so thank you TUAW! And if you’re having problems with your iPhone cellular data connection, try resetting the network settings yourself, it might just work.