Nokia HS-20 - Manual (Page 7)

Listen to the radio
To listen to the FM radio, start the radio feature of your phone. See the
user guide of your phone for details.
To search for a previously saved radio channel, press the fast forward or
rewind key repeatedly.
Lock or unlock the keys
To lock all keys except the call key, slide the lock switch (part 3) on the
side of the device towards the Nokia text. To unlock the keys, slide the
lock switch to the opposite direction.
Care and maintenance
Your device is a product of superior design and craftsmanship and should
be treated with care. The suggestions below will help you protect your
warranty coverage.