Using Joiku will be a violation of the TOS, because they don't allow a phone to be used as a modem.
Streaming Audio or Video violates the TOS, but their facebook page support tells their customers that they can stream youtube!?
With Opera web browser.. It is actually really easy to navigate on the web.
I get to use AT&T, T-Mobile, and Einstein towers. The reason I know what tower I am using is from an app on the Android market.
I have really good reception in every building that I have gone into. AT&T doesn't have coverage at my house, but T-Mobile does. I have been able to get 5 bars of service inside my house (E71).
ST is a very good deal for $45 a month since you are able to use any device that you want with the Unlocked SIM cards from the Nokia E71 and Nokia 6790