January 8, 2014
Beginning Jan. 3, under the limited-time offer, T-Mobile customers who switch to AT&T can trade-in their current smartphone for a promotion card of up to $250, which can be used toward AT&T products and services.
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AT&T Offers T-Mobile Customers up to $450 Per Line to Switch
AT&T is offering T-Mobile customers the opportunity to upgrade their mobile lifestyle with value of up to $450 per line when they switch to AT&T and trade in an eligible smartphone.