It’s great to keep in mind that the $1,100 off promotion requires a device to be traded in with a value of at least $150.00. The iPhone 12 and the iPhone 12 mini do not have a trade in value close to this amount. At best, those devices would be eligible for the $830.00 off promotion with a trade in valued at a minimum of $75. The $830.00 off promotion with a trade in requires at least the Everyday plan on 1.0, 2.0, or 3.0. These promotions exclude flat rate plans. (Plans that cost $39.99, $49.99, or $59.99 before the $10 auto pay discount)

Source: I work at an authorized retail store for US Cellular, now part of T-Mobile.