Have you encounter a situation when you network call quality or data network is bad/slow at certain area? Counting the bar by moving around might helps you with better signal but it's not really specific. With this tips, you can move around the actual signal bar convert into actual number for your checking.
This does not require the phone be jailbreak, have a try on it (as unsure if it will work with all version of iOS).
Remember:- The closer to zero the stronger the signal of the coverage within the area. Here are the steps:-
Step 1: Dial *3001#12345#* on your iPhone then press Call.
Step 2: You’ll now enter Field Test Mode. You’ll notice a signal strength indicator on the upper left hand corner of your screen. You can toggle between signal strength bars and a number by simply taping on it. At this point, press the home button to exit the app or if you would like the feature to be permanent, continue on. Don’t worry, the process is completely reversible.
Step 3: Hold down on the Power button until you see the ‘slide to power off’ bar. Do not power off the device.
Step 4: Press down on the Home button until the app closes and you return to your home screen.
That’s it. Even when restarting the iPhone, the signal strength can be toggled between bars and numbers. The closer your number is to zero, the stronger your signal is.
To return to the default bars permanently, follow these steps:
Step 1: Dial *3001#12345#* on your iPhone then press Call.
Step 2: Press on your Home Button once.
The second step essentially closes the Field Test mode. You won’t see it on your iPhone again unless you repeat the process.
