The offer is valid for AT&T, GoPhone and Cricket postpaid and prepaid customers that switch a phone number to a T-Mobile Simple Choice postpaid plan between December 4 and December 13.
AT&T customers can combine the offer with T-Mobile's Carrier Freedom promotion, which provides up to $650 towards a balance owing or to pay off early termination fees (ETFs) with an eligible device trade-in.
T-Mobile is also offering AT&T customers that switch up to half off its lineup of financed in-store accessories:
That could mean as much as a $125 discount on the hottest mobile gifts, like the latest smartwatches, UE Boom and JBL Bluetooth speakers, top-of-the-line headphones, Fitbit fitness trackers, Guitar Hero Live for iOS and more.This limited time offer is part of T-Mobile's monthlong "Un-carrier Unwrapped" holiday promotion that began with three months of free unlimited LTE data for all Simple Choice postpaid customers and a $200 bill credit for Sprint customers.
T-Mobile plans to unveil additional "gifts" over the next few weeks, with a new gift coming at least once per week. T-Mobile CEO John Legere recently confirmed on Twitter that Verizon customers will receive their "Un-carrier Unwrapped" gift soon.
T-Mobile also recently announced that Music Freedom now supports 11 new services: Aud.io, Dash Radio, DatPiff, Jango, KCRW, Noon Pacific, Radio Danz, SomaFM, Spinrilla, StreamOn and TuneIn Premium.