Know true value of cellphone signal (iPhone/iPad/iPodTouch)

To view true value of signal strength of your iPhone (3G and later, with iOS 4 or later) you have to enter into Field Test Mode on your device.

Entering Field Test Mode on iPhone (iPhone 3G and later on iOS 4 and later)

This will work on any iPhone model and any version of iOS, except the very original:

1. Open the Phone app as if you were going to make a regular phone call

2. From the iPhone keypad, dial *3001#12345#* and hit the “Call” button

After this your phone will change carrier signal bars/dots to show you a negative number. Signal numbers extend from -40 to -130. 

This is how to read these numbers: Anything above -80 is considered full signal strength. Calls usually start dropping or having bad connection around -110 and -120. Some users might see -130 before actually dropping the call. 

Eg. If you have signal strength of -50, you have a great carrier reception. -95 is not bad. -120 is when you better get ready to say bye as that call might drop at any moment.

How to keep numbers setting

Field test mode doesn’t last and you will be out of it when you lock your phone but, if you want to always see signal numbers rather than bars/dots then go through following steps.

1. Dial *3001#12345#* and hit “Call” if you haven’t done so already to launch Field Test.

2. Now hold down the Power button until the “Slide to Power Off” message appears, then release the Power button and hold the Home button until Field Test quits.

3. Tap the signal bars or signal numbers to switch between the two.

To remove the tap-to-switch signal indicator ability, you can either reboot the iPhone or go back into Field Test and close out of it as usual.

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