Originally Posted by carljmoss
I used to have an 8707v (a special for Vodafone, I think) that worked in Japan. Now I use a T-Mobile 9700 unlocked with a UK O2 SIM. It works excellently there.
The rule I was told (and wiser heads can correct me if I'm wrong), is that you'll be OK in Japan with a 3G GSM handset.
Nippon and Korea are picky on the supported handsets. A random 3G handset doesn't necessarily guarantee a trouble-free roaming experience. We got enough horror stories to publish a book.
Your 9700 is probably one of the best current solutions. Stick with it.