Instructions to get IMEI code for free on AT&T devices

How to find the IMEI code on AT&T devices for free. Instructions for displaying the IMEI code on a AT&T smartphone to release it, report it or use the warranty. Search your device among the wide range of AT&T devices available.

AT&T Mustang AT&T Mustang
AT&T SMT5700 AT&T SMT5700
AT&T Quickfire AT&T Quickfire
AT&T 8525 AT&T 8525