Comcast just launched a new phone service called Xfinity Mobile (CMCSA)

Comcast on Thursday took the wraps off of its new mobile phone service, Xfinity Mobile.
The company first confirmed it would launch a wireless phone service to compete against the likes of Verizon and AT&T last September.
Xfinity Mobile won’t be a total rival to those, though: It’s an MVNO, or mobile virtual network operator, that will piggyback off of Verizon’s wireless towers. This is similar to services like Cricket Wireless, which uses AT&T’s network, or Ting,