sometimes I have to manually force lte on using the lte onoff app or similar. although, as said above, the lte is down. if you are getting 1x, try
lte only with voice, if that doesn't work, try
cdma auto prl.
If that doesn't work, then most likely, it means lte and ehprd (3G) are down. you can force it to rev. A (3G) by doing the following and it may work. 3G, but 3G is better than 1x...
- Dial ##778#
- Press Call button
- The password is 000000
- Choose Edit Mode
- Go to Modem Settings
- Choose Rev A
- Switch from eHRPD to Enable
- Press OK
- Commit Modifications (reboot phone off/on)