Headset; Lock Or Unlock The Keys And Screen - Nokia 603 User Manual

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Headset

You can connect a compatible headset or compatible headphones to your phone.
Do not connect products that create an output signal, as this may damage the device.
Do not connect any voltage source to the Nokia AV connector. If you connect an external
device or headset, other than those approved by Nokia for use with this device, to the
Nokia AV connector, pay special attention to volume levels.

Lock or unlock the keys and screen

To avoid accidentally making a call when your phone is in your pocket or bag, lock the
keys and screen of your phone.
Press the key lock button, and select Unlock.