On T-Mobile... US coverage has been OK... anywhere I get T-Mobile/Cingular coverage I've had Blackberry access... Cities I've used it in the US recent with no issues... Major areas in No. and So. Calif, Chicagoland area and suburbs, New York metro area, Austin, Dallas...

For International, used it in Vancouver, Calgary, Edmonton (uses Fido... for now)

In Europe, UK, France, Germany, Finland and Spain. NO coverage in Ireland due to no GPRS agreement yet. But we have UK issued O2 units that work fine in Ireland that we swap out and have out IT folks reconfig that device PIN to our mailbox.

Also worked in Hong Kong last time I was through.

What I'm waiting for t-mobile to add GPRS roaming to is: Ireland, Australia, New Zealand, South Africa, Mexico and Taiwan... Since most network operators are looking at GPRS roaming as an extra revenue stream I'm sure we will get this at some point.

T-Mobile US's GPRS roaming list:
http://www.t-mobile.com/internationa...geInternet.asp

O2 UK's GPRS roaming list
http://www.o2.co.uk/business/product...0,,600,00.html

Vodafone UK's GPRS roaming list:
http://www.vodafone.co.uk/cgi-bin/CO...ng+GPRS+abroad

ATTWS:
http://www.attws.com/include/interna...ry_popup.jhtml
(No specific GPRS roaming list... you need to look at each country for a "data" feature on each network.