Convert Cellular Signal Bar to Number in iPhone & Hidden Codes

You may or may not be aware of it, but your iPhone has some secrets it’s been hiding from you, some of which are handy, some of which are hacky. Your iPhone has the ability to accept codes that can be typed into the phone application, each of which can do different things. I’m going to explain how to access these codes and what they do.

1. Activate Signal Number

This one is my favorite. After pressing code, you’ll be granted access to the Field Test app. Aside from the technical info that you’ll see here, you can also enable the ability to display a cellular reception number instead of bars.
The number represents how weak or strong your signal is. The higher the number, such as -100, the weaker the signal. The lower the number, -60, for instance, the better the signal. What’s even better is that you can replace those bars permanently just as I have on my own iPhone.

Here's how

➡ Dial *3001#12345#* and press call. It will open Field Test App.

➡ While in the Field Test app, tapping the area in the top left corner of the screen will switch the setting between bars and numbers.

➡ Once it’s set to numbers, hold the Sleep/Wake button until the iPhone displays the slide to power off screen. Do not power it off. Instead, hold down the home button until the power off screen disappears.

➡ Now you have numbers permanently. but you can easily swipe between bar & number by pressing the top left corner of screen. It make Signal Strength in number & bar changeable.
Bar to Number, Change Cellular Signal bar to number in iPhone
➡ Switch back to bars, simply dial the No. again & While in the Field Test app, tapping the area in the top left corner of the screen will switch the setting to bar again, now just press home button (Not sleep/wake button) & you back to bar.

2. Display IMEI

It’s probably not often that you need to retrieve your IMEI number. This code needed when your iPhone theft, but in the event that you do, save yourself some time by using this code.

*#06# (No need to press call)

3. Interrogation Settings for Call Forwards

It is used to set interrogation for call forwards. It discover the settings for your call forwarding. Using this you can check whether you have voice, data, fax, SMS,sync, async, packet access, and pad access call forwarding enabled or disabled on your iPhone.

*#21# & Press Call

4. Call Waiting

It is used to check if call waiting is enabled for your iPhone or not. It also shows call waiting status for voice, data, fax, SMS, sync data, async data, packet access and pad access. Each item is either enabled or disabled.

*#43# & Press Call

5. Calling Line Presentation Check

This displays whether you have enabled or disabled the presentation of the calling line, presumably the number of the party placing the call.

*#30# & Press Call

6. Connected Line Presentation Check

State whether the connected line presentation is enabled or disabled. Presumably similar to the calling line presentation.

*#76# & Press Call

7. Call Control Bar Check

Check all the usual suspects (voice, data, fax, sms, etc) to see whether barring is enabled or disabled for outgoing.

*#33# & Press Call

I decided to spend some more time to googling for phone codes that might work on the iPhone. There are more which i add tomorrow. Feel free to add your own to the comments.