APN setting for Iphone 5 running 6.0.1

To change your iPhone 5 APN setting 

1. Connect to WiFi
2. go to http://www.unlockit.co.nz
3. Select the 2nd icon from bottom "Create APN"
4. Select Country - USA, Carrier = AT&T MNVO (With Proxy)
5. Click Create APN
6. After downloading, it will ask to install.
7. Go ahead and install it.

Thats it.

Reference:
1. http://forums.macrumors.com/showpost.php?p=15813278&postcount=21