Anybody else been having issues with their phone signal? I know I am in a good 4G market and the signal has seem to have gone downhill a lot in the last two days.
With the serious lack of information given about your phone and general area where you live, I am going to say it is leprechauns.
In all seriousness though, it could be as simple as cell site maintenance. Are you experiencing slow speed, poor signal (less bars than normal) or something else?