Sprint Nextel VISION S1 - Manual (Page 36)

20 Section 2A: Phone Basics
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T9 Text Input lets you quickly type messages with one
keypress per letter (page 41).
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Speed dial lets you dial phone numbers stored in your
Contacts directory with one keypress (page 39).
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The built-in Bluetooth technology allows you to connect
wirelessly to a number of Bluetooth devices to share
information more easily than ever before (page 125).