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6. Verify good signal strength with the AT+CSQ command. A typical reply is +CSQ 26, 0. The first
number is signal strength and ranges from 0 to 31 (the higher the number, the stronger the
signal.)
7. Confirm your SIM card is properly installed with the AT^SCID command. A reply of ^SCID:<20
digit CID number> indicates the modem recognizes the SIM card and displays it's ID number.
8. Confirm the phone number currently in the modem with the AT+CNUM command. It should be
11 digits i.e. 15553331234. For some carriers the phone number may not display but will
respond with "OK". If the SIM card is not in the unit or not activated properly, the modem will
reply with "ERROR".
9. Confirm that the SIM's PIN has been authenticated by the network using the AT+CPIN?
command. The reply should read "+CPIN: READY". See Section 5 for SIM related information if
"READY" does not display.
10. Verify the modems International Mobile Equipment Identity (IMEI) number with the AT+CGSN
command. The IMEI is used to identify GSM mobile equipment to the GSM network.
If your account supports voice, you can confirm modem activation by performing a voice call to
another phone with the ATD<Cell Phone Number>; command (for example ATD15553331234; the
semicolon is required for voice calls). Your other phone should ring and the Caller ID should display
the modem's phone number.
Configuration and test of a Circuit Switch Data (CSD) call, and Packet Data Call (TCP/IP) as well as
other internet related connections are discussed in Section 4 next.
Figure 3.2: 819-GPRS HyperTerminal Modem Activation
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