As welcome as Transit Wireless' strategy for wireless in New York City subways has been, having access in just six stations around one Manhattan district has been limiting for locals who want to stay online underground. Thankfully, there's plans afoot to cover a much wider base. AT&T, Boingo and T-Mobile have offered to back a next wave of expansion that will cover 30 extra stations with cellular and WiFi access, in places we're more likely to recog