I can't pick up 5G signals on my iPhone
unable to pick up 5G signals even on cellular data making it hard for you to use them at a place where there is no Wi-Fi access.
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How to Measure Cellular Signal Strength in Your Area - Received on your iPhone from Your Carrier's Tower
RSRP is short for Reference Signal Received Power, used when measuring 4G LTE networks. A cellular phone or another LTE-equipped device would display signal strength in RSRP, measured 0dBm (best signal) to -110dBm (weakest/no signal). An RSRP of -95dBm would be a strong signal whereas -115dBm would be very weak.
The pic below is self-explanatory