Dothracki PE
Where is my mind?
This is a few years old, but interesting. Note that this map is based on amount of times the company's websites were viewed in each state, not actual phone user data. I wonder what this looks like now with T-mobile and Sprint merged and a lot of smaller providers that share networks with larger providers popping up. https://www.webfx.com/blog/internet/top-mobile-data-providers-state-by-state/