D-Link Mobile DWM-156 User Manual page 26

Problem Description
After D-Link dongle is plugged in, the
application can not find SIM/USIM card.
Sent Message failure.
Data connection failed.
Possible Causes
4. D-Link dongle is positioned in such a
way that adversely affects D-Link dongle's
signal reception.
The SIM/USIM card is not inserted
properly.
The network is busy or you are in an area
with no signal.
1. You are in the place where there is no
GSM/ GPRS/ EDGE/ WCDMA/
HSDPA(HSUPA) network coverage.
2. The network is busy.
3. The APN in the user configuration file is
incorrect.
4. D-Link dongle data is corrupted.
5. The network type has been selected
manually, but is incorrect.
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Problem Solution
4. Adjust the angle/position of D-Link
dongle or its proximity to other electronic
devices.
Reinsert the SIM/USIM card correctly.
Try later or move to an area with a
stronger signal.
1. Move to an area with good signal.
2. Try later.
3. Check the APN in the user configuration
file.
4. Local network access or the target
server may be experiencing problems.
Retry data request.
5. Reselect the network type according to
the type of the SIM/USIM card.