See Exact Cellular Signal Strength for Hotspot Happiness
If you use your iPhone or iPad to create a Wi-Fi hotspot for your other devices, you should know that a weak cellular signal not only may affect data transfer speed but also requires your your hotspot-supplying device to use more power — and that means your hotspot’s battery drains more quickly. If your device’s five dot signal-strength indicator does not give you enough information about the strength of a signal (“is that 3-dot signal closer to a 2 or a 4?”), you can make your device show you the exact RSSI (Received Signal Strength Indication) measured in decibel-milliwatts. Josh Centers has written up the steps in TidBITS.
Posted by Michael E. Cohen (Permalink)