What do you mean by "network coverage for my area is ok"? Are you saying your phone shows network coverage? Or do you mean something else?
If your phone doesn't show coverage at home, that will be an underlying cause of issues - in which case WiFi-calling could be a good mitigation.
When you say "all other functions" are OK, does this include those that use a network connection - specifically, sending/receiving text messages and/or using mobile data?
Use the "check service status" option on https://ee.co.uk/help/mobile-coverage-checker in the first instance, to check for local service outages. The "report a problem" link should be used if no issues are reported but EE users continue to have issues.A loss of coverage will remove the ability to make/receive calls, send/receive texts or use mobile data.
