Huawei F688 - Installation; Installing the SIM Card; Installing the Battery

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3 Installation
Ensure that F688 is powered off and disconnected from the power adapter.
Installing the SIM card
Ensure that the golden contacts of the SIM card are facing downward and that the
beveled edge of the SIM card is properly aligned with that of the SIM card slot. Then
check that the SIM card is fully inserted.
Installing the battery
Ensure that the golden contacts of the battery mate securely with those in the battery
slot.
 Base:
Do not frequently remove the SIM card when using F688.