Ting also happens to have some of the best customer service of any consumer facing company today. When you call them, you immediately get a human being that is intelligent and (every time I have dealt with them) able to solve your problem.

Yep I usually mention that as well as justinpombrio's comment, I just hate sounding like a shill. I'm simply an extremely satisfied customer from way back at launch.

One more thing: They are very friendly towards oddball devices. I had a Nokia 900 that they happily sent me a SIM card to fit, and helped me with APN settings (the defaults almost worked but needed to be tweaked a bit). They also more recently helped me get an iPad mini set up on the Sprint side. It took some finagling by the support person since they don't officially support that device, but they got me up and going. Their support staff is alway super friendly, I've never met a grumpy one even back when I was beta testing GSM on Windows Phone devices for them and had to call in several times a week.

Ting also has fantastic plans: you pay for what you use; if you use more you pay less per unit; all prices are clearly listed on their website; roaming charges are reasonable; there are no surprises.