My test drive ended yesterday. I work in a place that has epicly horrible cellular reception but excellent wifi coverage. It was enlightening being able to actually send and receive text messages and calls while at work
I had good reception all around town. It was only when I went into a large store like Sams Club that my signal tanked. I had no coverage while my wife on Verizon had 3 bars still. So there's definite gaps. Also did not have a chance to drive through the sticks where it's very rural to see how bad coverage is. I think I'm going to grab a cheap little Lumia 635 and sign up for the $50 a month plan. My employer does not offer a call phone and instead offers a stipend with the catch of having to install Airwatch. I'll use this as my daily driver for work and call and completely remove any work stuff from my personal device.
Oh and I checked with T-mobile and my employer still gets a 15% discount on plans. The $50 simple choice plan is closer to $40 a month. Not a terrible price. Worth it for the music streaming on vacations