Nokia 2135 - Manual (Page 19)

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■ Loudspeaker
You can use your phone as a loudspeaker during a call.
Warning: Do not hold the device near your ear
when the loudspeaker is in use because the volume
may be extremely loud.
To activate the loudspeaker during a call, select Loudsp..
To deactivate the loudspeaker during a call select Handset.
The loudspeaker is deactivated automatically when a
call (or a call attempt) ends or when certain enhancements
are connected.
4. Write text
You can enter text using traditional or predictive
text input. To change the text input method, and
to switch between upper and lower case, press the # key.