Using The Headset - Google GT-I9020 User Manual( Android User Guide) Owner's Manual

Your phone and accessories

Using the headset

The headset plugs into the phone's 3.5mm headset jack.
Microphone
You control the headphones' volume with the phone's Volume Up/Down button, and
with the applications on your phone (as described in the Android User's Guide and in
the documentation for your applications).
NSOG-1.0-104
Headphones
3.5mm headphone jack
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Nexus S Owner's Guide