Signal strength is measured using negative numbers in decibel milliwatts (dBm). The higher the measured value (i.e. closer to zero), the stronger the signal. For example, a value of -50 dBm is a very good signal, a value of -113 dBm represents a very weak signal with GSM/UMTS.
**So less dBm is a better value, so use this.
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Important: Trees with leaves, snow or fog can reduce the reception quality.
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