These codes can be divided into two categories: USSD codes and MMI codes. While these hidden codes are rarely useful to the average smartphone owner, they can be used to pique your interest once in a while. As a result, the goal of this article is to compile a comprehensive list of these secret codes for Android devices.

What is the USSD and MMI code?

While the average user may not need to know the distinction between these two, it is always useful to be aware of them. Both USSD and MMI codes are typically preceded by an asterisk or a pound symbol/hashtag. These codes are regularly updated as new versions of Android software are released, and some manufacturers have their own special codes as well.

The code entry procedure is straightforward, requiring only that you bring up your dialer keypad and enter the appropriate number sequence. It’s worth noting that some codes are carrier-specific, which means they won’t work on all devices. So, if your phone doesn’t respond to a code, don’t dwell on it; instead, move on and try again.

USSD code

USSD is an abbreviation for Unstructured Supplementary Service Data, and these codes are commonly used to communicate between your smartphone and your mobile network operator. This also means that in order for USSD codes to work, you must almost always be connected to your carrier.

Previously, USSD codes were used to initiate and terminate specific value-added services. They were also helpful in informing you of your data usage and prepaid balance, as well as providing access to a wealth of carrier-specific information.

fWhile smartphone enthusiasts continue to use them, USSD codes have largely fallen out of favor with general users because most carriers have their own app/website where most of this information can be easily accessed. USSD codes are typically carrier-specific and vary from one carrier to the next. You will need to contact your carrier to find out which ones apply to you.

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MMI Codes

MMI codes, on the other hand, are part of the Man Machine Interface schema and are typically unique to a smartphone brand or model. MMI codes provide access to a variety of interesting features on your smartphone, ranging from your IMEI number and SAR values to hidden menus commonly used by smartphone engineers and repair services.

Several smartphones, for example, allow users to enter an MMI code to access a ‘test’ menu. This menu allows users to quickly perform various tests on their smartphone, such as camera and vibration motor tests, as well as speaker and display tests.

Note that there are only a few MMI codes that typically work on all Android smartphones. We have listed the most popular ones in the generic list of codes below.

Info Codes

Generic secret codes for Android phones (Info codes)

Testing codes

Configuration codes

Developer codes

Manufacturer-specific codes

Samsung codes

Xiaomi Codes

Realme codes

OnePlus codes

Asus codes

Motorola

HTC

Sony codes

Nokia codes

Other codes 

Stay away from these codes! Think before using!

USSD codes for US carriers

These aren’t exactly hidden, but they’re not widely known either. Once dialed, USSD, or Unstructured Supplementary Service Data, codes connect to the phone’s network to perform specific functions, such as determining how much credit is left on your prepaid phone or how much data you’ve used this month. They change frequently, and the codes differ from carrier to carrier. Here are some examples for some of the major US carriers, along with links to more carrier-specific codes:

AT&T

• Check your data and SMS usage: *3282#

Verizon

• Check your data and SMS usage: #3282

T-Mobile

• Check your data usage: #932#

Sprint

• Check minutes, messages, and other usage stats: *4

There’s a good chance you’ll never need to use most of these codes, but if you do, then now you know where to find them.