Enter a SIM Unlock Code on a Nokia Lumia 635 with Windows Phone 8.1

You will need to get a device unlock code from a mobile provider before using this guide.  They are pretty cheap on the web, and free from AT&T at  If you purchased a GoPhone, and currently have an AT&T post-paid account, you need to use the “Non-AT&T Mobility Customer” option. It was very difficult to find […]