To assess LTE/5G signal strength on an iPhone.
Turn off Wifi
Dial *3001#12345#*
1. Understanding dBm:
- dBm is a logarithmic unit of measurement, meaning each 3 dB increase represents a doubling of the signal power.
- The typical range for cell signal strength is between -110 dBm and -30 dBm.
- A negative dBm value closer to zero is better. For instance, -60 dBm is better than -90 dBm.
2. Signal Strength Interpretation:
- Excellent: -50 dBm to -70 dBm (4-5 bars).
- Good: -70 dBm to -85 dBm (3-4 bars).
- Weak: -85 dBm to -100 dBm (1-2 bars).
- Poor: Below -100 dBm (0-1 bar).