The major US cablecos have been setting the pace in incorporating wireless into their service strategies, and until now Comcast has been the frontrunner. But its actual commercial launch only came this year, and was followed quickly by an alliance with Charter to cooperate on mobile services, bringing the two largest cable operators together in an axis which could be a threat, down the line, to the mobile carriers. Now Charter has provided more detail on its own plans to support wireless and converged services, and eventually a quad play to challenge Verizon and AT&T. Although the US cablecos dabble periodically with acquiring spectrum (Comcast secured airwaves in the recent 600 MHz auction), they have scarcely deployed licensed cellular networks…