Buy a 'free' iPhone 13 with trade-in at Verizon, T-Mobile and AT&T: What you need to know - CNET

AT&T came out of the gate with the best trade-in offer of the season, essentially giving away the iPhone 13 Pro and the iPhone 13 Mini for at a starting price that can go as low as "free" to new and existing customers.

It is also worth noting that T-Mobile has added a new Magenta Max iPhone upgrade program it calls Forever Upgrade that will guarantee you "up to $800" back (up to $700 for the Mini, or less if you're buying an iPhone 12 today) in future trade-in credits. 

The catch here: You will need to wait two years to trade in the iPhone 13 or iPhone 12 that you're buying today to get the credits, and you will need to be on Magenta Max for the entire time. 

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