Note
It is commonly believed that the number of bands on a mobile device clearly shows the quality of connectivity in a metal building. This approach needs to be corrected; it does not show the full picture and, accordingly, will not help solve the problem of a bad network.
When looking for an accurate metering method, it is essential to understand what the signal is measured in initially. Its strength is expressed in decibels (dB), and basic power figures range from -50 dB to -110 dB. A reasonable question arises: why is good reception with a minus sign? This is because the reference value is considered to be 0, and the further it is from the reference, the worse the connection. This situation is comparable to lowering the temperature on the thermometer: the lower it is below zero, the colder it is outside.
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