Not in my experience...
I have used the 8800 for 2 years on ATT and never told them I was going. It worked fine in Hong Kong and China.
Recently picked up the bold and didn't tell them I was going and it worked in Japan last month with no problems.
The only thing is if you don't want to get charged a crazy amount then get on that intl roaming plan.
All I did was use the phone and turned off all data and used wifi hotspots. The phone worked great, like I was home. Hope this helps.
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