AT&T today announced a new offer that will give T-Mobile customers up to $450 in credit to switch to AT&T. AT&T will give T-Mobile customers device trade-in credits of up to $250, which AT&T says can be used towards AT&T goods and services. Trade-in values will vary depending on the device and its condition. AT&T is also offering T-Mobile customers a $200 credit per line when they transfer their number to AT&T. In order to get the $200 credit, T-Mobile customers will need to activate an AT&T Next plan, buy a device at full retail price, or activate a device they already own. The offer, which will only be available for a limited time, goes into effect today.


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