These are only used for education purposes soo don’t miss use them. 

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Why do we use these codes :

We use them to make the things easier if in a situation we are not able to access our settings or our file browser due to app locks then we can use these codes to know what is in our phone so these are only for people who are in trouble with such activities don’t use this for other purposes 

Field Mode: *3001#12345#*

Type *3001#12345#* into your phone’s dialer and then press the green call button to access “Field Mode,” which can give you access to info about local networks and cell towers.

You’ll probably never ever have to know about your local cell tower’s “Measured RSSi,” but it’s fun to look around for a bit.

WHAT IS “FIELD TEST”:

One of the first steps to selecting a cell phone signal booster for your home or office, vehicle, or large building is to determine how strong the outside signal is. When most people talk about cell phone signal strength, they talk about “bars” in reference to the signal strength bar indicator on the phone.

General Test Mode: *#0*#

I could only get this to work on Android. But this prompts a library of different phone operations, which could be operated with a single push (e.g. Sleep, Front Cam, Vibration).

WHAT IS GENERAL TEST MODE:

This option is mainly for the android users and this option will help us know about what are the default system options available. These can be only accessed by the telephonic code and there are many options here available.  

 

Display your IMEI: *#06#

Here’s a code which I found out does not work with Verizon on an iPhone, but I could make it work after switching to a T-Mobile SIM. It also worked on my Android AT&T device as well. To access it, type in the above code, and then the green call button to prompt your IMEI number (or your International Mobile Station Equipment Identity number, but you already knew that).

The IMEI is unique to your device. Among other things, the number can help “blacklist” stolen devices or help with customer support.

Check Your Call Forwarding: *#67#

This code allows you to check which number your phone is currently forwarding calls to when you’re busy or reject a call.

By default, this is probably your carrier’s voicemail service, but you can change it to forward to a different number (a home number, office number, or third-party answering service for example). On an iPhone, you can change this number by going to Settings > Phone > Call Forwarding. On Android (varies from system to system), tap the Phone app > hamburger icon > Settings > Call > More Settings > Call forwarding

Call forwarding, or call diversion, is a telephony feature of some telephone switching systems which redirects a telephone call to another destination, which may be, for example, a mobile or another telephone number where the desired called party is available.

Get Even More Info on Call Forwarding: *#61#

On my Galaxy phone, this code prompted a pop-up that let me know how long until a call is forwarded to the message center. On the iPhone, regardless of carrier, this code just showed me the same info as *#67# .

Check Your Available Minutes: *646#                                                     Apparently this one only works on postpaid plans. I was not able to get it to work on my test iPhone (regardless of carrier; I tried three), but I did get it to work on my Galaxy phone (which happens to have an unlimited texting plan from AT&T). Instead of showing the info on a new screen, it sent my phone a text message.

Check Your Bill Balance: *225#

Once again, I couldn’t get this one to work on the iPhone, but on Android I did get it to prompt a SMS message with my current balance due.

Hide Your Phone From Caller ID: #31#

I could only get this to work on Android. But entering this code prompted a pop-up stating that my Caller ID had been disabled. In order to reinstate Caller ID, enter *31# .

Check Your Billing Cycle: *3282#

Once again, I could only get this to work on Android. It prompted an SMS message with my billing info.

SMS Message Center: *5005*7672#

This code will tell you your SMS message center number. I have no idea why you’d need that info, but there ya go.    

Activate Call Waiting: *43#                           This code will activate call waiting; you can deactivate it by entering #43#.                                                       

WHAT IS CALL WAITING:                                          a service whereby someone making a telephone call is notified of an incoming call on the line that they are already using, and is able to place the first call on hold while the second is answered.

 

Quick Test Menu (Samsung Galaxy Only) *#7353#

As far as I can tell, this code only works on Samsung Galaxy models (I tested it on my Galaxy S7 Edge). This is similar to the General Test mode mentioned earlier, in that it brings up a menu with a number of one-tap test prompts.

WHAT IS QUICK TEST:

It is a feature which is used to test all the parts in the phone manually whether they are working or not like we test speaker ,camera. 

Firmware (Samsung Galaxy Only) *#1234#                                                   Once again, as far as I can tell, this only works on Galaxy devices. But it will let you know your phone’s current firmware. So, have fun with that.

WHAT IS FIRMWARE :

Firmware, which is added at the time of manufacturing, is used to run user programs on the device and can be thought of as the software that allows hardware to run. … Firmware that is embedded in flash memory chips can be updated easier than firmware written to ROM or EPROM, which makes it more adaptable.