The respected Gadling blog recommends (in the States) the T-Mobile Blackberry Curve:

… I’ve written about the scam that is international roaming charges in the past …

Why the curve, and not the sexy iPhone? Well, the Blackberry Curve has 2 very interesting features you won’t find with any other carrier, or any other phone. One is unique to the phone itself, and one is unique to T-mobile.

click through to read the rest of the article – The best phone for international travel?