How to force your iPhone 3G / iPhone 3GS in UMTS / 3G mode only – Disable GSM / EDGE

This guide will help you to lock your iphone 3g and 3gs to the 3G / UMTS network ONLY. This will lock out the EDGE and gsm mode! please read the ENTIRE guide before doing this mod or you will brick your phone

Here is how to do this:

1. Jailbreak your phone
2. install SSH (the windows version is attached to this board, for MAC users use google. The default username is: root ,and default