When I had Sprint, if I had two or less dots on my iPhone 5S, LTE,  or 3G data was useless. 

I got my phone unlocked and switched to Cricket, which is AT&T prepaid. Now, even with one dot, in my house I get 8M of speed!. And I am paying less than half of what I was paying before. Cricket is much easier to deal with than Sprint. They actually have people you can talk to!