Like Dan said, Ting is a nationwide cell carrier that uses Sprint's network. They're pay as you go, which means instead of signing up in advance for a certain number of minutes & megs. You just pay for exactly what you use each month. You also have to provide your own Sprint-compatible phone, so your Ting bill doesn't subsidize the cost of your phone. My family of 3 smartphones generally costs us only about $52/month combined. It's a great setup for low-usage users. For power users who use 4G for everything and spend all day on the phone, you may be better off finding an unlimited plan. You can check out Ting's rates at https://ting.com/rates
Ting prides themselves on customer service, and for good reason. They've got a great sense of humor. I actually enjoy interacting with them. They have an online forum where you can suggest new features and vote on other people's suggestions. Popular suggestions are likely to get implemented.
I've been using them since last summer, and I wholeheartedly recommend them every chance I get. If you're interested in checking them out, using my referral code of https://znt1he1mog3.ting.com
will save you & I each $25 off our next bill.