[Atakicat]

I'm not sure about the frequency usage in Japan, But the main difference between mobiles and 2-way radios would be range. If you get good quality ones, 2-4 miles should be no problem. (although this varies with terrain, tall buildings, hills and such can reduce it) I have a pair of Motorola Talkabout T6250's That we use on drives and cruises, and I've managed to get almost 5 miles on them between cars on flat roads.. In city, it's usually down to about 2-3, but I'm in a pretty dense area.