Comcast has just transformed part of Houston into a WiFi commune by activating 50,000 residential Xfinity routers, according to the Houston Chronicle. The new service will give any Comcast client free WiFi access via those xfinitywifi hotspots, and is just the beginning of a larger rollout. As revealed earlier, the unloved cable outfit may eventually launch a mobile network using WiFi from subscribers modems along with leased cellular capacity, possibly from Verizon.