Apple's device tracking, locking, and wiping tool Find My iPhone is available for free with the iOS 4.2. By default it only works on the iPhone 4, f ...

Your guide to turning on Find My iPhone so your device is always trackable This article explains how to set up Find My (or ...

I then entered DFU mode and restored my iPhone 3GS with this iOS 4 firmware. At first I also applied my previous backup and then couldn't get a wireless signal through T-Mobile.