Thanks for posting. I'm very sorry to hear your mobile signal strength isn't very strong.
In order to help further I'd need you to answer the following questions:-
Have you got problems making/receiving calls?
Have you got problems sending/receiving texts?
Have you had better signal previously?
I've managed to check the local masts in your area and I can see a few have been down which could be causing this problem. I'd recommend you keep a close eye on things over the next few days and see if there are improvements.