Built-in Feature: iPod Touch (4th Gen)

Large Text : Font size

Increase text size (up to 56pt) in Calendar, Contacts, Mail, messages and more.

Detailson: Large Text : Font size
Built-in Feature: iPod Touch (4th Gen)

Messages : MMS

Multimedia Message Service (MMS) application called Messages lets you send text messages with multimedia attachments to one or more recipients at a time.

Detailson: Messages : MMS
Built-in Feature: iPod Touch (4th Gen)

TTY Support : Teletype machine

Use iPhone in TTY mode with standard teletype machines. Use of TTY requires the iPhone TTY Adapter (sold separately).

Detailson: TTY Support : Teletype machine