►Field Test Mode for iPhone and Android

Field Test Mode use to find the signal strength (dB) on your iPhone and Android Phone

Your phone can tell you exactly how strong its signal is, in decibels, by entering Field Test Mode. How to enter Field Test Mode varies from phone to phone, but it is very straightforward and doesn’t require jailbreaking or in any way damaging your phone!

Most phone screens display signal strength in “bars” at the top of the screen. But “bars” aren’t a very precise measurement. Some phones (like the iPhone) have 5 bars, others (like the Nexus One) have 4. One phone might display a signal strength as 3 bars, another might only call it 2. To assess the level of signal an amplifier will be working with, we need to be a lot more specific. We need to determine exactly what the signal strength is in decibels (dB). Decibels are a very precise unit of measurement, where lower values means strong signal (so -60 signifies stronger signal than -80, -80 is stronger than -90, etc).

Cell phone signal strength is measured in dB (decibels). As a general rule, -80dB or higher (ie, -70, -60, -50) is considered strong signal (full bars). -110dB or lower (ie, -120, -130) is very weak (dead zone).

Cell phone signal boosters improve your coverage by amplifying signals and improving the dB gain of your cell phone.
All our cell phone signal boosters have a listed dB value for better comparison.

To find the signal strength (dB) on your iPhone:

1. Go into Phone Mode