Comcast turns to flexible mobile tariffs to defend against AT&T, Verizon content push

After what feels like decades of build-up, Comcast late on Thursday finally detailed plans to address the mobile market in a bid to fend off growing competition from the likes of AT&T and Verizon.Called Xfinity Mobile, the service runs on Verizon's 4G network, but aims to make extensive use of WiFi, with devices automatically connecting and authenticating on one of Comcast's 16 million public hotspots whenever the customer is range.Comcast was also one of the participants in the recently-co