I have two active phones – A Nokia E71 running on an ATT SIM and an N96 running on a T-Mobile SIM. Because the T-Mobile SIM was initially provisioned for Blackberry service it seems to only have access to the T-zones access point which absolutely sucks. For starters, you can only have two simultaneous connections which means a multi-tasking device like the N96 (or any other N or E Series) bumps into this limit REGULARLY. In ordr to proceed past the warning about reaching the maximum number of connections, you must first request that an “offending application” stop doing what it was doing in order to try again in your current app. I would not be exaggerating to say I see this within 2 minutes of active use and continuously thereafter. WTF?!?!?! I never noticed this when the SIM was in the Blackberry and I’m guessing that because you pay such a premium for Blackberry data service it does not count against the two connections. Additionally the Blackberry really does not actively multi-task so it’s quite difficult to get two things competing to connect on the access point.
I’m aware this should be resolved with a change to my service agreement, but am unable to make those changes myself as the SIM and device are part of corporate plan. Regardless T-Zones is really a poor excuse for a data plan access point. People are using more not less. The limit should be the volume of data, not the way in which you connect.