I've been to 2 apple stores and 2 sprint stores and made calls to Senior Tech Support @ Sprint. My iPhone SE has been swapped twice. There is an issue with LTE. When turning on the phone and switching from WiFi to cellular, LTE does not connect. My zip code is 85225 is LTE is excellent in my area. iPhones 7, 8 and X don't have this issue.
Hey vision. Sorry to read the SE is giving you issues. You mentioned that the only device that is having trouble is the SE, correct? Is the issue everywhere you go or just at that 85225 zip code?
I will send you an Private message so that I can go over your area and take a closer look at your device. Please check your Inbox.
1900 MHz LTE has been restored in my area. Tech Support did not know it was down for 4 days. iPhones 7, 8 and X have 2.5 GHz so users of these phones weren't affected. But everything is groovy now.