No network connection

For the past couple months I've been experiencing no data coverage when I am outside and inside my home. I can't make calls or use my data at all. It only allows emergency calls. I don't know if its because more people are joining the network and iD hasn't improved their coverage, but no matter how cheap your sim only deals are nothing is worth this hassle. I've made the decision to finally leave after being stranded yesterday unable to make any calls as my data kept on dipping in and out. Going through other articles this seems to be a major problem. I'm going to a more reliable network like EE as even though it may be more pricey at lease I can RELY on their network coverage.