When used with a cellular GSM Modem such as the Siemens TC35, SwiftNote SMS toolkit measures the signal strength at regular intervals.
The Receive Signal Strength Indication (RSSI) is between 0 or -113dBm, and 31 or -51dBm (dBm is ratio and is decibels compared to 1 milliwatt which is an industry term used to describe the transmit or receive power of a wireless device.)
Reasons for poor signal strength:
Some times the signal strength will be 99/-1 meaning it cannot be detected. This could be caused by the location of the antenna.
In some devices the signal strength goes low before reception of a message, and in such cases should be ignored.
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