Honestly, this kind of statement makes me more likely to consider them. I was on post-paid T-Mobile many years ago, but I left because it was entirely unusable outside of cities. Signal would cut out entirely 4-5 times on a 2 hour drive. If my destination was anywhere with more than about 500 feet between houses, I was probably impossible to contact until I left. This just tells me that the situation might have improved.

I'm pretty happy with my current mobile provider (a Verizon low-priority MVNO), but if that changed I might seriously think about something that runs on T-Mobile.