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== modem USB ==
OK
AT+CPIN=1234
OK
+CPIN: READY
+QUSIM: 1
+QIND: SMS DONE
+QIND: PB DONE
AT+CSQ
+CSQ: 99,99
OK</pre>
''Where '''1234''' is your SIM card's pin number.''
*+CSQ: 99,99 denotes an undetectable signal. If we use an antenna, we can get better coverage. [http://m2msupport.net/m2msupport/atcsq-signal-quality/ Here] you can find a table with the relationship between CSQ value and dBm, as well as a guide to recognise how strong a signal level is.
*You can find more Quectel UC20 compatible AT commands [http://www.soyter.pl/system/files/UC20_AT_Commands_Manual_V1.0.pdf here].
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