Hello Teena B,
I'm sorry to hear about your situation during this pandemic. It sounds like you're having issues using 4G network in your area.
This article explains LTE and 4G
"Depending on the wireless carrier, 4G can indicate either a UMTS or LTE connection. If your carrier doesn't support VoLTE and is a CDMA carrier, you'll only see an option to Enable LTE. This allows cellular-data use over the LTE network when available. "
About the LTE options on your iPhone
If you are having issues with connecting to service, the following article will walk you through some troubleshooting steps you can attempt.
If you see No Service or Searching on your iPhone or iPad
If after you follow the steps you're still having the same issue I would recommend contacting your carrier.
"If you need help finding your wireless carrier's service page, use the Apple carrier-support article or an online search engine."
Hope this helps! Good luck!