Signal strength measurements will be in the Serving Cell Measurements> section. IPhone’s powered by a Qualcomm modem, which includes models sold by Verizon or Sprint (A1660 (iPhone 7), A1661 (iPhone 7 Plus), A1863 (iPhone 8), A1864 (iPhone 8 Plus) and A1865 (iPhone X)) have a different Field Test Mode: Prior to iOS 11, four “bars” or “dots” had the range -85 to -94 dBm, and there was a fifth dot for > -85 dBm. RSRQ (Reference Signal Received Quality) also takes into account noise and interference.
The 0 or 1 do not refer to a particular antenna, but rsrp0 displays the stronger of the signals measured by the two antennas.Įxtra credit: SINR stands for Signal-to-Interference-plus-Noise Ratio – if the environment is RF “noisy” SINR is actually used to determine the number of “bars”. rsrp0 and rsrp1 refer the two antennas in an iPhone (one at the top of the phone and one at the bottom). RSRP (Reference Signal Received Power) is the primary measurement used to determine the number of “bars”.
Signal strength details can be found in the LTE>Serving Cell Meas> section. IPhones powered by an Intel modem which includes models sold by AT&T and T-Mobile (A1784 (iPhone 7), A1778 (iPhone 7 Plus), A1905 (iPhone 8), A1897 (iPhone 8 Plus) and A1901 (iPhone X)) will look like this: IPhone’s have two slightly different versions of Field Test Mode depending on which model of iPhone you have. 1 To activate Field Test Mode on an iPhone dial *3001#12345#* You can see the numeric value for yourself in Field Test Mode. The bars on your phone are a visual representation of this measurement. Cell phones measure received signal strength in dBm (decibels referenced to 1mW, a logarithmic scale where 1mW is equal to 0dBm).
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