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Cell Phone Signal Strength Measure Instructions
2017.07.26
标签 : Signal Strength Measure Instructions for Cell Phones

How to find cell signal strength by your cell phones? Dbm is more accurate than bars. This instructions will tell you how to use field test mode on Iphone and Android Phones that is the best measure way. 





Read Bars is not Accurate! 


Peoples usually read the cell phone bars to evaulate the signal strength. But it's not accurate, there are no standards across different carriers for displaying the bars. Different cell phone manufacturers may define different signal strength indications. That means one phone's 3 bars may well represent a stronger signal strength than another phone's 4 bars or even 5 bars.


For example:


In the same room or work place, your cell phone may look like this:


Signal Strength ≥ -85 dBm, level is SIGNAL GREAT, define 4 bars

Signal Strength ≥ -95 dBm, level is SIGNAL GOOD, define 3 bars

Signal Strength ≥ -105 dBm, level is SIGNAL MODERATE, define 2 bars

Signal Strength ≥ -115 dBm, level is SIGNAL POOR, define 1 bar

Signal Strength ≥ -140 dBm, level is SIGNAL NONE or UNKNOWN define 0 bar


And your colleages' cell phone with another carrier's network or brand may will show this:


Signal Strength ≥ -95 dBm, level is SIGNAL GREAT, define 4 bars

Signal Strength ≥ -105 dBm, level is SIGNAL GOOD, define 3 bars

Signal Strength ≥ -115 dBm, level is SIGNAL MODERATE, define 2 bars

Signal Strength ≥ -120 dBm, level is SIGNAL POOR, define 1 bar

Signal Strength ≥ -140 dBm, level is SIGNAL NONE or UNKNOWN define 0 bar


So the best way to check the signal strenth dBm reading by your cell phones "Field Test Mode"  




Iphone Field Test Mode 


number 1 Dial *3001#12345#* and press the Call button. This will launch the Field Test Mode.


Iphone Field Test

Iphone Field Test Mode

 



number 2 Hold down the power button until the “Slide to Power Off” appears, then release the power button.


iphone power off button



number 3 Then hold the Home button until the Field Test mode quits.


So now you’ll see your numerical signal strength on the top line of your phone; you can tap the signal numbers to switch to signal bars and vice versa. The negative number is the decibel signal strength reading and should be based on the carrier name and the network type.

iphone signal strength show


To exit this permanent field-test mode, reboot the phone or go back to Field Test and exit it via the Home button.

 



Android Field Test Mode


step 1  Press MENU


step 2 Choose "Settings"

·

choose settings



step 3  Choose "About Phone"

choose about phone



step 4 Choose "Status" or "Network" depending on your manufacturer


choose status



step 5   Check "Signal Strength"


check signal strength