Asus PadFone X Manual page 13

3. Align and insert the micro-SIM card into the
micro-SIM card slot with the gold-plated
contacts facing upward.
4. Push the micro-SIM card all the way into the
slot until it is seated firmly in place.
5. Replace the rear cover.
6. Press down the rear cover on all sides to secure
it in place.
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