EchoStar/DISH-owned Boost Mobile is the fourth carrier, cleaved off of Sprint by Ajit Pai and co during the T-Mobile/Sprint merger process; DISH now claims it is able to provide coverage to 70% of the population in the US.

The problem is EchoStar/DISH are saddled with debt and Boost still uses its agreements with AT&T to throw at least some customers on AT&T coverage instead of its own.