With a post consisting of two words, this leaves more questions than answers!
Are you reporting a problem with lack of coverage in a specific location? Or a loss of coverage where you've had service before? Are you in the UK or abroad? Have you tried restarting your phone.
The online coverage webtool allows you to check for predicted coverage, and also known issues in specific areas - https://ee.co.uk/help/mobile-coverage-checker
Otherwise feel free to respond with some more details of your query
