Japanese 3g Handsets
If you brought a Soft-Bank 3g handset to England, unlocked the same, and inserted a 3 SIM in the phone, it would work. The other standards are complete incompatible with the rest of the world except for a couple of very high priced hybrid phones that never sold very well. There was a CDMA handset that did the Japanese variant of CDMA and the 800mhz version of CDMA used in many other countries, but it didn't even do the 1900mhz band of CDMA so countries like the US were not covered very well. You could roam into China, Korea, and OZ with the phone.
When I visited Japan a couple of years ago, I decided that the best approach was to go with rental. The English language version of the DoCoMo page suggested that you could purchase a prepaid, but everything else I heard suggested to the contrary. Until a year or two ago, you could purchase prepaid handsets from some party stores, but then Japan started "cracking" down on prepaid registrations because of a kidnapping where the kidnappers used a prepaid phone. I've heard that even American soliders and sailors stationed in Japan have a hard time buying Japanese prepaids because they lack the necessary Japanese documents.
I'm not sure how much discretion a friendly merchant has, but language is a huge issue in Japan. My niece purchased a prepaid in Japan after the crack down, but I don't know how she did it, but she is exceptionally cute and a fluent Japanese speaker. She also legally lived in Japan from 2000 through 2002, currently works for a Japanese company's US office, probably still had some Japanese ID card and certainly has friends who would buy one for her. I hate to use her as a precedent for anything.
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