AT Commands ( Signal )

From TechnologicalWiki

• AT+CSQ : This Command is used to ascertain the received signal strength indication (<rssi>) and the channel bit error rate (<ber>) with or without a SIM card inserted.

Obtaining a response like this :

   +CSQ: <rssi>,<res>
   OK

   <rssi> = 0 indicates -113 dBm or less
          = 1 indicates -111 dBm
          = 2..30 indicates -109..-53 dBm
          = 31 indicates -51dBm or more
          = 99 indicates Unknown
   <ber>  = 0..7: as RXQUAL values in the table GSM 05.08
          = 99 indicates Unknown percentage

   e.g. +CSQ: 13,99

[edit] References

How To manage your cell phone using AT Commands