Apple iPod touch iOS 8.1 - Manual (Page 44)

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Messages
iMessage service
With the Messages app and the built-in iMessage feature, you can send text messages over
Wi-Fi to others using iOS 5 or later, or OS X Mountain Lion or later. Messages can include photos,
videos, and other info. You can see when people are typing, and let them know when you’ve
read their messages. If you’re signed into iMessage using the same Apple ID on other iOS devices
or a Mac (OS X Mavericks or later), you can start a conversation on one device and continue it on
another. For security, messages you send with iMessage are encrypted before they’re sent.
If you have an iPhone (iOS 8) signed into iMessage using the same Apple ID, you can also
send and receive SMS and MMS messages on your iPod touch. Charges may apply to the text
messaging service for your iPhone.
WARNING: For important information about avoiding distractions that could lead to dangerous
situations, see Important safety information on page 149.
Note: Cellular data charges or additional fees may apply for iPhone and iPad users you exchange
messages with over their cellular data network.