Important Links

MST: Mobile Sales Tool is the best way to find out prices & promo's specifically. 

https://mst.att.com/ 

IMEI Checker: Check if the customers phone has a clean IMEI for trading in. 

https://www.imeipro.info/tmobile-imei-check.html

AT&T TRADE IN: Check the value for the customers trade-in device.

https://tradein.att.com