If you wonder what exactly the secret codes are, they are USSD codes that provide information when you select them from your smartphone. Android smartphones have their own set of secret codes, but each smartphone has its own set of codes derived from the manufacturer.
Therefore, it isn’t easy to monitor them. There are a handful of cool iPhone secret codes that everyone should know. Curious about it? Here are ten secret iPhone codes you should know in 2020.
10 Hidden iPhone Secret Codes You Should Know
Before viewing all the codes for iOS devices, please note that most of them are operator specific. Most importantly, they do not work worldwide due to restrictions or unwillingness of the operator to adopt these codes. So don’t be surprised if some of these cool codes don’t work for you. Let’s start with this little disclaimer.
1. Field test mode
This secret code on the phone activates the field test mode, which gives you many technical details about your network. That’s not all, as you can also use this passcode on your iPhone to get a more accurate picture of your network signal strength. Bars are a great way to see the signal strength. However, if you want to know the exact intensity, you can use this code to display the signal strength in decibels. This is how you do it:
On iOS 10 or earlier
If you enter the code into your iPhone dialer and press the call button, you will be directed to the Field Test page, where you will find various network details. Then press the power button unless you get the “slide to turn off” option.
Once you’re on the shutdown screen, hold down the home button, and the bars will be replaced by the strength of the network in decibels.
When you have finished, wait for 20 to 30 seconds for the network to stabilize. Then you can write down your signal strength if the number is more significant than -80 (-70, -60), the signal strength is almost full, and if it is less than -110 (-120,130).
The network has a relatively weak signal. It is important to note that the signal strength varies depending on whether you are connected to a 3G or 4G network.
To disable decibels and revert to the usual network bars on your iPhone, you can reopen the field test page with the passcode and tap the top left margin that says “Phone” or just tap the start button.
In iOS 11, 12 and 13
With the invention of iOS 11, Apple slightly changed the functionality of “field test mode.” For a change, the dBm (decibel milliwatt) digital signal display is no longer displayed in the iPhone status bar.
But don’t worry, there is still a way to check the actual cellular signal as numbers on the iPhone using the field test mode in iOS 13, iOS 12, and iOS 11. First, make sure your iPhone has an active cellular connection. You can access and use the field test mode to measure the signal strength. Just open the phone app, enter the following number, and dial it.
Now the test mode for hidden fields will open on your iPhone. Press LTE and then select “Serving Cell Meas.” Then you will find the rsrp0 and the corresponding number, which will be the digital measure of the iPhone’s cellular signal strength in dBm. For those unfamiliar with it, RSRP (Reference Received Signal Power) is considered a variation of the RSSI measurement. The RSRQ is short for Reference Received Signal Quality. While rsrp0 is the provisional cell tower, rsrp1 is the closest cell tower.
2. Hide caller ID
Code: *31# (Mobile phone number)
If you have an iPhone or an operator that supports hiding your caller ID, you can use this access code to display your caller ID as “Unknown” or “No Caller ID.” Caller ID “. All you have to do is use the valid code in your country, add the mobile phone number you want to call anonymously, and press the dial key.
We tried to hide our caller ID with the code, but it didn’t work for us. Therefore, we recommend that you keep your expectations low.
3. Check the SMS center
Any text message you send from your phone is first forwarded to a server or SMS center number, which is then sent to the number you added. If you have a problem with SMS, it is better to check the SMS center number, and you can use this secret code to do it. Enter the code into the iPhone dialer and click “Call.”
4. Call waiting
*#43# (check status)
*43# (activate call waiting)
#43# (disable call waiting)
As you may have guessed, with this iPhone access code, you can only check the status of the call on hold and only activate or deactivate it. This should come in handy if you didn’t find the call waiting for options on your iPhone.
5. Call restriction
*#33# (check status)
*33*Pin# (activate call restriction)
#33*pin# (call restriction)
Call barring allows you to block all incoming or outgoing calls on your phone. If you want to check the status or enable or disable it on your iPhone, you can use this access code. The “pin” here is the SIM pin, which is the lock on your SIM card. You can activate it in iPhone Settings-> Phone-> SIM PIN.
6. Call forwarding
Code:*#21# (check status)
*21# (enable or disable call forwarding)
*21mobilenumber# (forward calls to this number)
Don’t want to be bothered by a phone call while watching your favorite sports team fight? For people who don’t know, Call Forwarding is a feature that allows you to forward incoming calls to your other number or even to voicemail. With these passwords, you can check the status of your phone or activate it and send calls to another number.
7. Presentation of the call line
If the recipient of your calls cannot see your cell phone number, there may be a problem with the appearance of the call appearance of your number. In this case, you can use this code to check if the call appearance display is on or off.
You probably already know this code. For people who don’t know, all phones have their unique ID number, and you can use this USSD code to verify it on almost any phone. You can find more information about IMEI and its use in our detailed article.
9. Show your number in caller ID
Code: *82 (followed by the number you are calling)
This code is intended for people who make all outgoing calls anonymously. If you are one of them, you can use this code to display your number in the caller ID. This can be particularly helpful in situations where you want someone to know that you are the caller. While*82 works for most network operators, T-Mobile has a separate code for this purpose (*31#).
10. Obtain local traffic information
At a time when you have many first-class navigation applications such as Google Maps, Apple Maps, Waze, etc. For many, this code is always unnecessary to keep you updated with traffic information. But I would still tell you to save it for those times when you don’t have an internet connection and want to get accurate traffic information to get to your destination without getting stuck in blocked traffic.