The new iPhone SE, at $429, is Apple's smallest and least expensive new iPhone. It's designed for people new to the iPhone, or who have been hanging on to older iPhones for a while.
I've been reviewing iPhones for 15 years now, and for people with older phones, it's amazing how much things have changed (although the phones may look the same). Cameras and radios, especially, have gotten a lot better over the years, giving you faster connections, better low-light photography, and superior selfies.
But at the same time, if it ain't broke, you don't need to upgrade. If your phone works just fine, and you're satisfied with its speed, camera, and connectivity, you can stick with it.
Here's a rundown of who I think should consider upgrading, and whether they need to step up to the new iPhone SE:
iPhone 5s or earlier: Upgrade immediately. If your phone still works at all, it's dependent on 3G networks that are being turned off this year. You need a new iPhone to be able to keep making phone calls, and the iPhone SE is the most affordable option.
iPhone 6: Definitely upgrade. While your phone isn't being cut off from making phone calls, it's several generations behind on iOS, and apps may become less reliable with time. The cameras and connectivity on the new iPhone SE are also both massively better.
iPhone SE (2016): Definitely upgrade. Going from a 1-megapixel front-facing camera to a 7-megapixel sensor will change how everyone sees you. And the 2016 SE's signal reception is pretty bad now; it's missing frequencies for all the carriers.
iPhone 6s, 7, 8: Upgrade if you're on T-Mobile, period. These phones are missing a key frequency band (71) that matters a lot for T-Mobile coverage. They may also be starting to feel slow or
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