Apple just unveiled three new iPhones during its annual September press conference, the three phones we all expected to see Apple announce. But it also killed six models in the process, retiring the aging iPhone SE, iPhone 6 and 6 Plus, iPhone 6s and 6s Plus, and the iPhone X. While Apple won’t sell these particular phones in store, it doesn’t mean they’re just going to disappear. They may become even more attractive to buyers looking for used iPhone deals. But if you are going to buy one of the older phones, especially the iPhone 6 and iPhone 6s, make sure you verify the health of their batteries and replace them before Apple’s deal expires.