Opticon H21 - Manual (Page 19)

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1.8. SIM Card Installation
You must install a SIM card to use the phone functions of your H-21. Perform the following
procedures to install the SIM card.
Note: Power off the device and remove the battery before inserting a SIM card. Make sure the SIM
card snaps correctly into the SIM socket.
1.8.1.
Removing the Battery Cover
CAUTION! Make sure the device is turned off before you attempt to remove the battery cover.
Otherwise the device will shut off automatically and unsaved data may be lost.
1.8.2. Removing the Battery Cover cont.
Step 1:
Use the tip of the stylus to perform the following
procedures. Do not use excessive force.
· First slide the lock release to the unlock position
(A).
· Then turn the lock button to the unlock position
(B).
Note: The battery cover locks will only unlock in this
order.