D-Link DWR-720/PW User Manual page 56

Q. "Insert SIM card" appears on the screen.
A. Make sure the SIM card is correctly installed. Check if the SIM card works properly in another device where possible.
SIM card may be defective or faulty. Please contact you Network Provider for a SIM swop if faulty.
Q. Poor sound quality, echo or noise makes communication difficult.
A. Hang-up your phone and dial again. The Network may connect the phone to a line with better communication quality.
If the problem persists, please contact you Network Provider.
Q. "Not in-service area. Network failure." is displayed.
A. Check the signal indicator. If there is no signal, you may be in the basement or network blind area in a building.
Please move to other locations to receive signal. Or potentially you are not in a coverage area. If so, please contact your
Network Provider for assistance.
Q. Battery Life Short/Decreases.
A. Signal at your location is weak so that the phone has to search signal for a long time. When you don't want to answer
any calls, please power off. It is also possible that the battery has been used for a long time and approaches its life-span.
In this case, please replace the battery.
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