Anyone using Google's Project Fi (https://fi.google.com/about/faq/)cellphone service?
$20 a month unlimited voice and text. $10 per GB of data used. Paid for and un-used data gets you a credit on your account the next month. (Taxes, etc, extra as per usual.)
A combination of T-Mobile and Sprint networks plus Wi-Fi.
For now you need a Nexus 6 phone, $500 intro offer, unlocked. No contracts.
I would love to sign up and give them a try. But coverage in the area of our cabin sucks. It's fine here at home.