Sprint Nextel m620 - Manual (Page 21)

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Messaging
You can send and receive emails and text messages
and participate in Web-based chatrooms right from
your phone. Messaging allows you to stay connected to
friends, family, and coworkers 24 hours a day anywhere
on the Sprint National Network.
Message Types
There are many types of text messaging available on
your phone. These include SMS Text Messaging, Sprint
Instant Messaging, Email, and Chat.