I have the Android version of FF3 on my tablet and I'm trying to work on the side quests. However I don't have the option to send mail or check friend code. Talking to the moogle just takes me straight into the inbox for messages from NPCs. I am connected over Wi-Fi and can browse the web fine. Was this simply not ported over for the smartphone/tablet version?
Sounds like you have the same version as on my iPad. If so, you don't need to (and actually can't) send mail; you will receive mail from NPCs as certain milestones and events occur during the game and you will be able to do the side quests after you receive the appropriate mails. . Have you received any mail yet?
He's got the whole world in His hands: earth, wind, fire, water, and time.