If you are wondering what exactly are secret codes, well, these are USSD codes that bring about some information when you dial them from your cell phone. Android cell phones accompanied their own set of secret codes however every various cell phone accompanies its own set of codes, derived by its manufacturer and thus, it’s a difficult task keeping a track of them. Then again, there are a handful of cool iPhone passwords that work universally on all iPhones. Curious about it? Don’t be! Here are 8 cool secret iPhone codes that you must know:

1. Field Test Mode

Code: *3001#12345#*

This secret code on the phone triggers the Field Test Mode, which provides you a lot of technical details around your network. That’s not all though, as you can also utilize this code on your iPhone to get a more granular look at your network’s signal strength. The bars are a good approach to view signal strength but if you need to know the exact strength, you can utilize this code to view signal strength in decibels. Along these lines, here’s how to do it:

When you enter the code in your iPhone’s dialer and hit the call button, you will take to the Field Test page, where you will discover numerous networks details. Then, just press hold on the Power/Lock button unless you get the “Slide to turn off” choice. Once you are on the power off screen, just press hold the home button and you will see the bars replaced with the network strength in decibels.

Once done, wait for 20-30 seconds for the network to settle down. Then, you can take a note of your signal strength, If the number is above -80 (-70,-60..), the signal strength is near full and if it’s below -110 (-120,130..) , the network has pretty weak signal. It’s important to note that the signal strength will fluctuate on if you are connected to a 3G or 4G network.

To disable the decibels and get back the usual network bars on your iPhone, you can open Field Test page again with the password and tap on the top-left edge, which says “Phone” or you can just press the home button once.

2. Hide Caller ID

Code: *31#mobile number

If you have a carrier unlocked iPhone or a carrier that supports hiding your caller ID, you can utilize this secret code to present your caller ID as “Unknown” or “No Caller ID”. All you want to do is utilize the code that works in your country and include the mobile number you need to call anonymously and press dial.

3. Check SMS center

Code: *#5005*7672#

Each text message that you send from your phone first goes to a server or SMS center number, which then sends it to the number you send it to. If you have been facing a few issues regarding SMS, it’s best to check the SMS center number and you can utilize this password to do exactly that. You can simply enter the code in the iPhone’s dialer and press “call”.

4. Call Waiting

Code: *#43# (Check Status), *43# (Enable Call Waiting), #43# (Disable Call Waiting)

As you may have guessed, this iPhone secret code just gives you to check the status of Call Waiting and enable or deactivate it with easy. This should come in handy if you just can’t appear to discover the Call Waiting choices in your iPhone.

5. Call Barring

Code: *#33# (Check status), *33*pin# (Enable Call Barring), #33*pin# (Call Barring)

Call Barring gives you to block all incoming or outgoing calls on your phone and if you want to check its status or enable/deactivate it on your iPhone, you can utilize this code. The “pin” here is the SIM Pin, which is the lock on your SIM card. You can enable it in iPhone Settings->Phone->SIM PIN.

6. Call Forwarding

Code: *#21# (Check Status), *21# (Enable or Disable Call Forwarding), *21mobilenumber# (Divert Calls to this Number)

Don’t need to be disturbed by a phone call while you watch your favorite sports team fight it out? Well, for people unaware, Call Forwarding is a feature that gives you to divert incoming calls to your other number or even a voicemail and you can utilize these secret codes to check its status on your phone or to enable it and divert calls to another number.

7. Calling Line Presentation

Code: *#30#

If the recipient of your calls aren’t able to view your mobile number, there may be tricky with your number’s Calling Line Presentation. In that case, you can utilize this code to check if Call Line Presentation is enabled or disabled.

8. IMEI

Code: *#06#

Chances are, you already knew about this code, didn’t you? For people unaware, all phones come with their distinctive identification number and you can utilize this USSD code to check it on almost any phone. For more details on IMEI and its usage, you can check out our detailed article on the same.