Cheap and good service, not easy to find. What you use totally depends on your area. I use MetroPCS for my kids but the service in my area is pretty poor, but the support is great when I had to add new phones, never had an issue getting through or getting things done. Of course I do research before I even contact them so don't try to do anything I know they won't be able to LOL
For wide coverage anything that runs on Verizon towers should be good, Total Wireless is Verizon's own cheaper brand and may be good to try.