supports 4G LTE for data, but it lacks . Since major carriers have shut down their 2G and 3G networks, you likely cannot make standard phone calls or send SMS texts on most modern networks.
on a new plan because it cannot support E911 services without VoLTE.
If you are buying one as a secondary "distraction-free" device or collectible, follow these steps: How to Completely Check a Used iPhone Before Buying!