Unstructured Supplementary Service Data (USSD)-also known as “quick codes” or “feature codes” is an extra UI protocol, which allows people to access hidden features. USSD codes allow users to directly communicate with their service provider’s computers and/or access back-end features in their device. They are accessed by inputting them into the phone dialer and usually start and end with a * or # with a sequence of numbers between them.
The USSD are unique for every phone model and carrier. We have highlighted the most common USSD accessible in most android phones
- IMEI number: *06#
The IMEI is unique to your device. Among other things, the number can help “blacklist” stolen devices or help with customer support. Type *06# on your dialer it will pop up
- Hide Caller ID: *31#
You might have received a call from unknown number. The caller might have hidden the ID intentionally or sometimes it can be accidental. If you want to hide the caller ID dial *31# and press call button.
- To reveal caller ID: #31#
If you had hidden the caller ID while making a call or you realize your caller ID is hidden, all you need to do is dial #31# and press the call button
- 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.
- Get more info on Call Forwarding: *#61#
On Galaxy phone this will show how long it takes before the call is forwarded. On other phones it may show same results as *#67#
- Activate call Waiting: *43#
This code activates call waiting. When someone calls when you are on another call he will be prompted to wait
- Deactivate call waiting: #43#
If you want to deactivate call waiting dial #43#.
- General Test mode: *#0*#
This prompts a library of different phone operations, which could be operated with a single push (e.g. Sleep, Front Cam, Vibration).
There are a lot of information you can retrieve using USSD. This varies from one phone to the other. If you experience a major issue which can’t be solved through USSD you can take your phone to professionals for diagnostics
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FAQs
What is *# 9900? ›
*#9900# Opens up system dump mode.
What does * * 7780 * * do? ›2. *#*#7780#*#* (Run a Factory Reset) If you don't want to run a hard reset, this is the next best thing. Similar to a factory reset, this code will simply delete all application data from your device, as well as any applications.
What happens if you dial *# 31? ›Hide Caller ID: *31#
The caller might have hidden the ID intentionally or sometimes it can be accidental. If you want to hide the caller ID dial *31# and press call button.
If you would like to know some more detailed information and test your android device then from your phone dialer just dial *#*#4636#*#* it will show up results like Phone Information, Usage Statistics, Battery Information, and Wi-fi Information.
What is the master pin to unlock every phone? ›There is no master pin for an Android phone. Everything from 0000 1234 or whatever you can think of. What is the master pin code to unlock Android devices?
What does the code * * 4636 * * do? ›Android code: *#*#4636#*#*
This code will open up a menu that shows information about your phone's data usages. Here's how you can retrieve deleted text messages on your iPhone.
Use the code *2767*3855# to delete all data and reset all settings on your #Samsung phone #MobileTip #MoArmouz | Coding, Phone, Samsung.
What does ## 002 do to your phone? ›Security of Android Smartphone codes : Code ## 002 # ~ Deactivates all forwarding. Code * # 21 # ~ To know whether message or call has been diverted or not.
What is this code for * 33 * 0000? ›MTNza on Twitter: "@MbowaneEvans To unblock outgoing calls, please dial #33*0000#. To unblock incoming call, please dial #35*0000# Thanks /MD" / Twitter.
What is *# 0011? ›...
Samsung (for Galaxy S4 and later)
| Code | Description |
|---|---|
| *#0011# | Service Menu |
| *#0283# | loopback test |
| *#06# | imei |
| *#03# | nandflashheaderread |
What happens if I dial * 77? ›
Anonymous Call Rejection (*77) stops calls from people that use a blocking feature to keep their name or number from being displayed. When Anonymous Call Rejection is turned on, callers will hear a message telling them to hang up, turn off the blocking feature, and call again.
What is code *# 0 *#? ›Key hardware info: *#0*#
When you enter *#0*# into the phone's dialer, the device enters service mode and brings up a diagnostics menu. From this screen, you can view and run multiple diagnostics to test device hardware like buttons, sensors, and cameras.
When you dial *#21#, you are, in fact, activating a feature access code that quickly tells you the status of call forwarding for your phone. It's a quick way of seeing what, in the case of this particular 'setting interrogation code,' your call forwarding settings.
What is the Android code for hidden menu? ›- *#*#759#*#* - This code will let you access RIz debug UI.
- *#0*# - This code will let you see the info menu.
- *#*#4636#*#* - If the previous code does not work, you can see your info menu with this one.
- *#*#34971539#*#* - This code will let you see your camera information.
A Master PIN code, as the name suggests, allows master access to the lock.
What is Android unlock PIN? ›The PIN or password is used as part of the key to decrypt the data stored on an encrypted Android device.
What is override force dark in developer options? ›In the Android 10 Developer Settings, a new option was added called “Override force-dark” which essentially inverts the color scheme of your phone's apps to go from being bright with dark text to dark with bright text. However, if an app is already dark, the opposite happens, making the app very bright.
What are the best developer options on Android? ›- USB Debugging: This is probably the most used option due to several factors. ...
- Mock location: ...
- Animation settings: ...
- Stay awake option: ...
- OEM unlocking – ...
- Disable Absolute Volume: ...
- Dark mode: ...
- Enhance gaming performance:
No, pressing the *3370# keys on your iPhone or Android device does not improve your cell phone signal. As mentioned, the code *3370# activates Enhanced Full Rate Codec on specific devices. Since users would experience better voice quality after entering the code, many assumed it was due to better signal.
What does *# 30 do on Android? ›#2 NUMBER IDENTIFICATION: The code *#30# will help you turn your number identification on or off.
What is the code to check if your phone is being monitored? ›
Hackers can track your location through your phone. Press *#*#4636#*#* or *#*#197328640#*#* to see if anyone is watching your movements. These are Utility Net Monitor Codes. Dialing these codes can tell you if you're being tracked or monitored through your mobile phone.
What is * 68 used for? ›Dialing *68 will disable the Caller ID for the next outbound / external call only. Selecting a line and dialing this feature code will result in a prompt on the phone display as well as an audible message: "Caller ID is BLOCKED for the next outbound call only."
What happens to your phone when you dial *# 9900? ›The *#9900# code is a diagnostic code used on Samsung mobile devices. It opens the "SysDump" mode, which provides advanced system information and options for troubleshooting and debugging purposes.
What is security hub on Android phone? ›Security Hub provides teams & organizations insight into the security of their mobile device fleet while protecting the privacy of their users. Security Hub detects compromise, critical security updates and poor device security hygiene such as disabling screen lock and biometric security features.
What does ## 004 do? ›Call “##004#”
No one will answer when you call it, but it will turn off conditional forwarding on your phone. It will reset your phone to its default phone settings.
61 to divert calls not answered after 15 seconds. 62 to divert calls when your phone is switched off. 67 to divert calls when your phone is engaged.
What is *# 61 in mobile? ›Dial *#61# to request status of call diversion on your number when you are not responding. Dial *#67# to request status of call diversion on your number when your line is busy. Dial *#62# to request status of call diversion on your number when your handset is turned off or has not coverage.
What does * 35 * 0000 do? ›For incoming off please dial *35*0000# and for outgoing off *33*0000# (free) from your mobile. For incoming activate please dial #35*0000# and for outgoing activate #33*0000# (free) from your mobile. Please go through and follow the provided link accordingly to your answer easily.
What is *# 35 * 0000 * 16? ›If you want to block incoming Safaricom messages, dial *35*0000*16#. To confirm whether the set-up is successful, dial *#35#. The process to divert Safaricom calls can effectively protect one's privacy and safety. Anyone can enjoy greater control and security with simple steps such as accessing the phone settings.
What is code 330 * 0000? ›Safaricom PLC on Twitter: "@Zakech2 To Deactivate all barrings dial #330*Barring Code #OK. The Default Barring code is 0000.
What does * 002 * do? ›
How to cancel call divert/forwarding on MTN. You can deactivate call divert on your MTN SIM card by dialing this shortcode: ##002#. Dialing this code will erase all call divert options on your SIM card. Enter the code: ##002#.
What does *# 2663 do? ›*#2663# This code shows the touch screen (TSP and Touch Key) firmware information of your mobile phone.
What phone code is 0011 94? ›Country phone codes
+94 is the country calling code assigned to Sri Lanka by the International Telecommunication Union.
Activate Call Trace
Hang up the phone after receiving a harassing call. Pick up the phone and press *57 (touch tone) or 1157 (rotary). You'll hear a confirmation tone and message will be heard If the trace is successful.
Disable call forwarding on US Cellular
Enter *720. Press the call button. Wait until you hear the confirmation tone. This confirms that you deactivated call forwarding on your US Cellular number.
The next time you receive a call from a number you wish to block, end the call and dial *97. The number will automatically be added to your Selective Call Rejection list.
What is *# 899? ›You can open the ColorOS engineering mode by *#899# but it's just the components' test section.
What is *# o6? ›For a Google Pixel, dial *#06# on your phone's keyboard to get the IMEI number. For phones with a removable battery, some IMEI numbers are listed on a sticker under the battery on the back of the phone.
What is the secret diagnostic menu? ›| CODE | FUNCTION |
|---|---|
| *#*#426#*#* | Google Play Services info or Firebase Cloud Messaging diagnostics (Select devices only) |
| *#*#759#*#* | Access Rlz Debug UI (Select devices only) |
| *#0*# | Info menu (Select devices only) |
| *#*#4636#*#* | Info menu (Select devices only) |
Call barring lets you block incoming or outgoing calls to and from your phone. This may be useful if you keep receiving unwanted telemarketer calls or want to avoid expensive international calls. To check if the feature is enabled on your device, dial *#33#. Use the code *33*pin# to enable call barring on your iPhone.
What is * 62 * number used for? ›
| Forward service | Activate | Cancel & Deregister |
|---|---|---|
| if busy | *67*[phone number]# | ##67# |
| if not answered (see below for custom delay) | *61*[phone number]# | ##61# |
| if out of reach | *62*[phone number]# | ##62# |
| all forwards | *002*[phone number]# | ##002# |
Best Codes for Managing Calls and Messages
*#61# – See how long it takes to forward calls. *31# – Turn on caller ID. #31# – Turn off caller ID. *43# – Turn on call waiting.
The Keystore API uses both types of cryptography in order to safeguard secrets. A public/private key RSA pair is generated, which is stored in the Android device's keystore and protected usually by the device PIN. An AES-based symmetric key is also generated, which is used to encrypt and decrypt the secrets.
How to find hidden activity in Android? ›Tap on the three dots that are present at the upper-right of the device screen. Click on the home screen settings. It will navigate you to the Hide apps menu; tap on it. Here, you will see the hidden apps that are not showing in the app list.
What does delete dumpstate logcat do? ›Delete dumpstate in Android is a diagnostic tool that stores data about the state of your device. This data can be used to analyze potential issues and troubleshoot problems with your device. To delete dumpstate in Android, you will need to access the "Settings" menu on your device.
What files should I delete to free up space Android? ›- Close apps that don't respond. You don't usually need to close apps. ...
- Uninstall apps you don't use. If you uninstall an app and need it later, you can download it again. ...
- Clear the app's cache & data. You can usually clear an app's cache and data with your phone's Settings app.
*#9900# – Access System dump mode.
What is the code for Samsung signal booster? ›Hidden Battery Power / Boost Signal Strength
By pressing *3370# or #3370#, you'll activate your phone's “reserve battery power”. Battery life will increase by 50%.
Device logs contain information recorded by the system and apps on your device. These logs are stored temporarily and are deleted on a rolling basis.
What is log cat? ›Logcat is a command-line tool that dumps a log of system messages including messages that you have written from your app with the Log class. This page is about the command-line logcat tool, but you can also view log messages from the Logcat window in Android Studio.
How do I delete system logs on Android? ›
On a Samsung *#9900# , this will take you to SysDump. Select 2nd option(Delete Dumpstate/Logcat). Save this answer.
How do I delete other files from internal Storage on Android? ›...
How to clear app data
- Open Settings.
- Tap Apps.
- Tap the app you wish to clear data from. ...
- Tap Storage.
- Tap Clear cache or Clear data.
Other in storage Samsung refers to the miscellaneous files and data that are stored on the device. This can include temporary files, system files, and other data that is not associated with a specific app or data. To free up space on your device, you can delete these files.
What does *# 0 *# do? ›When you enter *#0*# into the phone's dialer, the device enters service mode and brings up a diagnostics menu. From this screen, you can view and run multiple diagnostics to test device hardware like buttons, sensors, and cameras.
What does *# 62 do? ›*#21# - By dialling this USSD code, you would get to know if your calls have been diverted somewhere else or not. *#62# - With this, you can know if any of your calls - voice, data, fax, SMS etc, has been forwarded or diverted without your knowledge.
What does dump mode mean? ›Hex Dump mode (also called data dump) is a special feature that makes it easy for experienced users to find the cause of communication problems between the printer and the computer. In the Hex Dump mode, the printer produces an exact printout of the codes it receives.
What is the code for network booster? ›Android code: *#*#7262626#*#*
Knowing this is helpful in deciding whether or not to install a signal boosting system.
Unlock Code for Samsung SGH-E400
Turn your Samsung device on after inserting the SIM card Type *2767*688# and press Exit.