List of Keitai Features that Don't Work Outside of Japan

Pretty much everything that normally would work in Japan, won't work outside of Japan. Brazil can get the 1seg broadcasts, but not the audio. i-mode, i-appli, Yahoo! Keitai, Osaifu-Keitai, Mail, Chaku-Moji, MMS, etc. won't work outside Japan. Calling and SMS work however, along with video playback and audio playback, and whatever games come loaded on your Keitai.