BT OpenZone trumpets their side of the WBA roaming agreement: they can count 20,000 hotspots in their roaming arrangements: T-Mobile may have nearly 12,000 hotspots between the Wireless Broadband Alliance's six members who they're roaming with and T-Mobile's international locations, but BT had already cast its roaming net wider with The Cloud, TeliaSonera, and Airpath.