It's an interesting mash-up: Qwest is no threat to AT&T, occupying no overlapping territory both being former Baby Bells, and Qwest has no wireless cellular division. This lack of conflict probably makes it an ideal customer to buy access from AT&T to 17,000 U.S. hotspots and offer those at no cost to its broadband subscribers. With Boingo now down to $10 per month, one could say this value is about $6 worth, since Boingo is a superset of all AT&T locations with many thousands of others on top.
With Verizon perhaps nearing a deal to offer regional or national access to Boingo's network; AT&T with its extensive system in place; T-Mobile with a network of home and roaming partners available cheaply; and Qwest now part of the gang--Sprint Nextel appears rather the odd one out.
Of course, Qwest, Verizon, and AT&T are focused on their wired broadband customers, and AT&T is the only carrier to also offer free Wi-Fi to some of its mobile subscribers. Sprint has no wired broadband any more, and Verizon is entirely 3G oriented for mobile broadband. Cablevision is the only multiple systems operator (MSO) that's offering free Wi-Fi, and in its case that's the network it's building out in its home area at great expense.