Signal bars don’t tell you as much as you think. If you really want to know the strength of your cell signal, use this hidden app.
We’ve become reliant on signal bars to tell us how strong our cellular connection is, but the bars are not accurate. Every phone manufacturer gets to decide how much signal strength equals how many bars, and it often varies widely from model to model.
If you really want to know how strong your cell signal is, you need to look at a direct measurement of the signal strength, as measured in decibels (dB). Fortunately, there’s a hidden “Field Test” menu on your iPhone. This guide should work for anyone on iOS 11 or iOS 12.