Originally Posted by jopfer
Folks, it IS NOT the service books, trust me! Think about it. If anyone could use any WiFI phone with UMA on T-mobile without paying for the HotSpot@home service T-mobile would go broke giving everyone free calls.
Except that's now how H@H works. Even if you don't have the H@H add-on plan, you can still use UMA. However, your minutes are deducted like normal, as if you were on the cellular network. Many people opt to get H@H phones without the H@H add-on plan. $20/mo buys a fair number of minutes in a standard mobile package. If you don't use enough minutes regularly every month to make up $20 worth of regular mobile package price, then the H@H add-on plan is actually a money loser for the consumer, rather than a money saver. Even without the H@H add-on plan, UMA is still a benefit for people as it helps ensure people have good coverage while at home(/work/friends'/etc).
I think ultimately T-Mobile would prefer as many people as possible connect via UMA, as it reduces their cellular network load. UMA saves T-Mobile money in cellular site infrastructure.