Now, here are the conditions. Those who switch to T-Mobile must activate two new service lines, one for the new device. That's all. Existing T-Mobile customers must activate at least one new qualifying service line and exchange a handset (for more information about this later). Whether you are a new subscriber or an existing subscriber, the new handset must be purchased with the help of an EIP, and any down payment or tax must be paid at the time of purchase.
If you are a T-Mobile customer, you must follow these conditions for your exchange. If you buy an Apple iPhone, the exchange must include one of the following models:
All trades must be in good working order, with no physical or liquid damage. Find my iPhone and all Android anti-theft features should be disabled when you trade.