Utstar pn820 User Guide

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Your phone is able to operate with TTY (Teletypewriter) digital modes. 
This feature is system dependent and may not be available in all areas.

 From the Home screen, press the left soft key < 

[Start].

 Select Settings and press O [OK].

 Scroll to Call Options and press O [OK].

 Select TTY mode (Full, Talk, Hear, Off)

 Press [Done].