The iPhone SE is now listed on willmyphonework.net, so you can see the SE's carrier-compatibility ratings there. The Sprint version of the SE is sub-model A1723; and sub-model A1662 is for AT&T, Verizon (I think), and T-Mobile. Based on the
site's ratings, the SE has good compatibility with many USA carriers depending on the sub-model. However, the SE falls short of the near-universal compatibility performance of the iPhone 6S. IMO, the SE is a good phone for the price, and you'll get what you pay for.