If you sell your iPhone 11, you can get the iPhone 13 for less

Apple iPhone 11 Review: The iPhone for Nearly Everybody

Apple iPhone 13 - Features, Specs & Reviews

Upgrading to the iPhone 13: iPhone 11 owners head the list - 9to5Mac

Buy a 'free' iPhone 13 with trade-in: Everything to know about Verizon, T-Mobile and AT&T's deals - CNET

What to do before you sell, give away, or trade in your iPhone or iPad - Apple Support

Best Ways To Sell Your iPhone

As Smartphone Industry Sputters, the iPhone Expands Its Dominance - The New York Times

The best iPhones to buy in 2023 - The Verge

When is the best time to buy an iPhone?

Apple Has Discontinued 4 Old iPhones

The iPhone 13 mini: A Review for Those Who Want a Smaller Phone