Your smartphone is capable of more than you think, and your carrier knows how to unlock all of its secrets by pressing just a few buttons. These codes, called Unstructured Supplementary Service Data (USSD), can be used to scan networks and activate service right from your phone’s dialer.
USSD codes are similar to the “vertical service codes” used by landline phones, which trigger special effects like call waiting, caller ID block and more. Tap or click here to see these secret codes for your phone.
What can USSD codes do for your phone? As it turns out, you can learn about the strength of your network, your equipment ID number and tons of other helpful information. Here are some of the best secret codes you can use with your smartphone.
USSD codes were created to give carriers and technicians a way to perform diagnostic tests and activations quickly. You don’t have to work for a mobile carrier to use these codes, however. Anyone can try them by punching them into the phone dialer menu and tapping the call button.
Not all carriers use the same codes for the same services. Some carriers may assign special functions to certain codes that are exclusive to their network. Check the lists below for your carrier and see which features their USSD codes can unlock.
Blocks outgoing Caller ID on a per-call basis. Information still visible to toll-free numbers and 911
*86
Check your voicemail
Universal USSD codes
Several USSD codes for all devices can clue you into information like your signal strength regardless of which carrier you have. Try the codes out below and see what you can learn.
Field Mode: *3001#12345#*
Type*3001#12345#*into your dialer and then press the call button to access “Field Mode,” which can give you access to info about local networks and cell towers.
Field Mode shows your cell phone signal strength measured in decibels (dBm). If the dBm approaches -120, you’re in a “dead zone.” Anything better than -100 is considered a usable signal. A strong signal is -40 or better. So, the closer that number is to zero, the better the phone’s signal.
Try Field Mode out and see where you catch the best signal.
Display your IMEI: *#06#
Type in the above code to access it, and then tap the call button to prompt your IMEI number. If your device is stolen, you can give this number to your carrier to have them blacklist it.
Check Your Call Forwarding: *#67#
You can use this code to check which number your phone forwards unanswered calls to. This is usually your carrier’s voicemail service, but you can change it to forward to a different number.
On an iPhone, you can change this number by going to Settings > Phone > Call Forwarding. Make sure Call Forwarding is toggled on, then tap Forward To and enter the number you want calls forwarded to.
On Android, the steps will vary from manufacturer and phone model. On most Androids, you can change the settings using the following steps:
Tap the Phone app > three-line icon > Settings > Call > More Settings > Call forwarding.
This code lets you check which number your phone is currently forwarding calls to when you’re busy or reject a call.
It’s surprising how much you can do with these phone codes. If you ever need a break from incoming calls or want to dial out without sharing your info, using a USSD code makes it easy.
Now, if only there were codes to stop robocalls.
Tap or click here to discover an app that does the next best thing: block and sue robocallers.
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.
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.
*#7353# – Open the Quick test menu. *#*#273282*255*663282*#*#* – Make a backup of your media files. *#*#7780#*#* – Factory reset your Android phone.
What does ##002 do to your phone? Dialing ##002# deactivates any conditional or unconditional call forwarding settings on your account and also deletes any data such as messages or voicemails that were previously diverted to another number. This code only applies to phones on GSM networks such as AT&T or T-mobile.
On most European telephone networks, and GSM or UMTS mobile phones, call waiting is activated by dialing the following codes: To activate: *43# To deactivate: #43# To check status: *#43#
What is * 228 and why is it important? Dialing *228 + "Send" on your wireless phone updates the roaming list. By performing this update, your phone will access the Verizon Wireless network whenever possible.
*#9900# is often referred to as the "sysdump" or "sysdump mode" code. When entered into the dialer and called, it opens a system dump menu on the device. The system dump is essentially a log of system-level information and error messages from the phone's operating system and apps.
4 *#0283# This code controls Audio Loopback. 5 *#1575# Manage and control GPS Menu. Phone Information Codes. 1 *#*#4636#*#* This is the code for your phone information. 2 *#*#4986*2650468#*#* This code is used to View Phone's PDA , H/W, RFCallDate details.
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. You can block up to 100 numbers. To manage or modify your Selective Call Rejection list, dial *60 and follow the prompts.
Solution. Call trace allows you to dial the code *57 to trace the phone number of a call that was received. This service is used to trace harassing calls which warrant law enforcement or legal action. If you do not intend to take legal action, then an alternative is to use Call Return with *69.
This number is an internationally recognised code. 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.
*#0*# is to test some mobile functions to find out any hardware problem like screen colors, dim Light, tourch, vibration and receiver and some other functions it is for maintenance purposes if you wanna try this test make sure to know how to exist from a function to another some mobiles use volume up not for all ...
Display phone information and usage statistics (*#*#4636#*#*) Among the most useful Android secret codes is *#*#4636#*#*. It displays the phone info, usage statistics, and Wi-Fi details. You'll see battery usage and Wi-Fi details, find options to set a preferred network type, and be able to run ping tests.
What is #3370# supposed to do? According to that email, pressing #3370# allows you to access a hidden reserve of battery power, so that when you restart "the instrument will show a 50 percent increase in battery" and this reserve will recharge the next time you start your phone.
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 re-instate Caller ID, enter *31# .
Fortunately, there's a code (netmonitor code) that helps you identify whether or not you're being tracked or tapped. To confirm this, dial any of the codes below for your phone's operating system: For Android devices, dial: *#*#197328640#*#* or *#*#4636#*#*
A homemade cell phone signal booster won't be effective if the incoming outdoor signal is also limited, but a professional solution such as the weBoost Office 100 Signal Booster can cover 2,000 sq ft with the same existing weak outside signal.
What does dialing *#21# actually do? 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.
Code to check if phone is tapped: *#21# Code to show unknown connections and tracking (for Android): *#*#4636#*#* or *#*#197328640#*#* Code to show unknown connections and if someone is tracing you (for iPhone): *3001#12345#* Code to find your phone if lost or stolen (for Android): *#*#1472365#*#*
Introduction: My name is Frankie Dare, I am a funny, beautiful, proud, fair, pleasant, cheerful, enthusiastic person who loves writing and wants to share my knowledge and understanding with you.
We notice you're using an ad blocker
Without advertising income, we can't keep making this site awesome for you.
