So, you've checked the service in your area, now what? Well, if it has displayed an issue with your area then you just have to sit tight. Mast problems get sorted by engineers, so they will go back to normal soon. If it displays poor signal in your area due to lack of masts then I'm afraid that there is nothing that can be done.
If there is no problem in your area:
If there are no issues displayed in your area then you should assume that it isn't a local area problem. Sometimes the tool takes a little while to update, but it's best to assume that it isn't related.
We prepared a guide to help you identify the signal issues to solve them, have a look here.