Wirelessly posted (BlackBerry8100/4.2.0 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/100)

I have a blackberry phone on t mobile unlimited international data roaming.

I know it is supposed to cover email traffic only, however, I have never been charged even when teathering it as a modem. I have been very conservative.

Is there a maximum data that might cause me a problem?

I don't know, but many countries (on their international BB plans) only let you have 20 megs of Blackberry roaming outside their home market. I might use that as some sort of guide.

Does TMobile's plan permit you to wap browse, IM, or do other data related functions while on your BB?

I've been charged per Mb while browsing and tethering while on the international unlimited email. Took about 6 weeks to show up. I wouldn't advise using it freely.

Wirelessly posted (BlackBerry8100/4.2.0 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/100)

What country? How many mbs?

I've been criticized before when I've said it, but I really think there is a difference in what slips buy depending whether you are BIS or BES customer. If you are a BES customer your data is tunneled back to your home server and less gets noticed. Also, it depends on what access point you use. If your stuff goes through the wap.voicestream node I'm sure it gets noticed. A Blackberry Browser back to your home server seemed to fly by. For example Shape Service's IM tunnels back on BES connections and think flies under the radar. It also is helped by the fact that it is an IM program which means it uses a minuscule amount of data.

I've also wondered whether people who tether with Shark Modem are less likely to get spotted then folks who tether using Blackberry's software. Having said all of the foregoing, no matter how much you you cloak and disguise your data consumption, you are not going to make a DVD download pass for a Blackberry mail download.

UK, about 3 Mb.