Do using email on smartphone uses up my phone memory? I uses Sony xperia x10 (using android) and downloaded the yahoo mail from market. It will syn up the email that one I uses online. But there are more than 10k email in my yahoo email account. Does it work like downloading all the mail to my phone or just simply web-based? I realized that even I turn off my internet connection, all the email is still there in my phone. So? I know this question was stupid but seriously want to know about that. A million thanks in advance.