P.S. Some of the 'big' carriers, now and then, offer much less expensive 'plans'. Some event beat the prices in this article, if your 'Data' needs are limited.
I've used Mint for a little over a year, no major issues past setup. I've noticed being "deprioritized" a few times but it hasn't been terrible. Only thing is that T-Mobile was definitely better / easier for international roaming.