woohoo! finally i can use emoji icons(emonicons) on iphone2.2! offically only for japanese iphone... BUT there is a way to use emoji :
1)download .vcf file below.
2)send the file to yourself via e-mail.
3)open the file on your iphone, then add all to your contact list.
4)try type "えもじあ(emojia)" , "えもじい(emojii)", or "えもじう(emojiu)"in japanese using text or notes.
note: you can send emoji to only whom has iphone 2.2.