Nokia 20 User Manual

©2001 Nokia Mobile Phones. All rights reserved.

1

Check that the data cable is firmly connected to the terminal and to the PC or other compatible 
device.

2

Check that the power supply is firmly connected to the terminal and to an AC wall outlet.

3

Check that the antenna is firmly connected to the terminal.

4

Disconnect the power supply from the AC wall outlet before you check that the SIM card is installed 
properly.

If there are problems with the reception, for example interruptions in the service, the signal may be too 
weak. Check the signal strength with the following AT command in the HyperTerminal connection 
window: 

at+csq

. 

The response is 

+csq: <rssi>, 99. 

The parameters for <rssi> are:

0

-113 dBm or less, poor coverage

1

-111 dBm, medium coverage

2...30

-109... -53 dBm at 2 dBm intervals, good coverage

31

-51 dBm or greater, excellent coverage

99

not known or not detectable