AT&T Offers T-Mobile Customers Up to $450 to Switch

AT&T wants T-Mobile customers. And the carrier is willing to pay for it. Starting today, the carrier is offering up to $450 per line for T-Mobile customers who make the switch and trade in an eligible smartphone. 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, AT&T said. Story.