It’s official: T-Mobile has gotten under AT&T’s skin. AT&T announced on Friday that it will offer T-Mobile customers up to $450 per line when they switch to AT&T, a stunning preemptive strike that’s being done in response to a rumor that T-Mobile plans to pay off subscribers’ early termination fees when they switch from another carrier. The $450 payout will include the standard $250 that switchers can receive when they trade in their old device as well as an additional $200 payout specifically aimed at T-Mobile subscribers. The company’s full press release follows below.

AT&T Offers T-Mobile Customers Up To $450 Per Line To Switch

DALLAS, Jan. 3, 2014 /PRNewswire/ — Starting today, 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.

In addition to a larger and more reliable 4G LTE network, T-Mobile customers who switch to AT&T will benefit from a superior smartphone line-up and award-winning customer service. With AT&T, customers can take advantage of AT&T’s new Mobile Share Value plans, which offer data and unlimited talk and text starting as low as $45 per month with no annual contract.** AT&T NextSM offers customers the chance to upgrade to a new smartphone every year for $0 down.

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. Trade-in values will vary based on make, model and age of the smartphone, but many of the latest and most popular smartphones will qualify for a value of $250. T-Mobile customers can receive an additional $200 credit per line when they transfer their wireless service to AT&T and choose an AT&T NextSM plan, buy a device at full retail price or activate a device they currently own.1

Only AT&T offers the nation’s most reliable 4G LTE network, covering more than 270 million Americans.2 J.D. Power awarded AT&T the “Highest Ranked Customer Service Performance Among Full-Service Wireless Providers” and “Highest Satisfaction with the Purchase Experience among Full Service Wireless Providers” in their 2013, Volume 2 studies.

T-Mobile customers can learn more by visiting www.att.com/switchfromtmo or an AT&T retail store.