[Resolved]  DoCoMo — docomo phone

hi I'm from Philippines,i have friend who is there in japan already now..he send me an email last 2 weeks already to his Docomo phone but until now i cant still send him an email..they just told me that the only people can send him an email was the only people who use a docomo phone or the people who is stay in japan.. what should i do? he just only know my yahoo account, i try to use allot of accounts like hot mail, g mail, yahoo or even a japan website i try to register also just hoping that i can send him an email i try to send a mail and ask question to Docomo also...
somebody help me please...