Dial *3001#12345#* and press the Call button. This will launch the Field Test Mode app and where the bars/dots were in the top left corner of the screen, you'll now see a negative number. The negative number is the decibel signal strength reading and should be followed by the carrier name and then the network type.
Once your wi-fi and LTE are off, pull up your phone's keypad as if you intend to call and dial the following: *3001#12345#* followed by the Call button. This should take you to the field test display and give you several options such as your SIM info, serving cell measurements, and your connected mode.
Accessing Field Test Mode on an iPhone
Dial *3001#12345#*. This will launch the hidden Field Test Mode. Field Test Mode has two main tabs, All metrics, and Dashboard. In All metrics, you get to access different sections that display various types of data revolving around your cellular connection.
Does the *3370# Code Boost Cell Signal? 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.
If you want to hide the caller ID dial *31# and press call button. This code allows you to check which number your phone is currently forwarding calls to when you're busy or reject a call. If you want to deactivate call waiting dial #43#.
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 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.
Security of Android Smartphone codes : Code ## 002 # ~ Deactivates all forwarding. Code * # 21 # ~ To know whether message or call has been diverted or not.
Lastly, with the *#002# settings interrogation short code, you can see all forms of call forwarding on your line. If everything says "Disabled," you have nothing to worry about. If there are numbers listed, they could be put there by someone else, or they could be the number for your voicemail box.
Check Your iPhone's Signal (*3001#12345#*) To check how much signal your iPhone has, enter Field Test Mode by typing *3001#12345#* on the keypad. This allows you to check all the details about your iPhone's signal, such as settings, network, and other technical data.
Check Call barring
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#.
Tips: *#31# is a secret code on smartphone that allows users to hide their number when phoning someone. A failed call in iPhone could also be the result of call anonymity. To see if your phone number identity is hidden when making outgoing calls, dial *#31# to check your status.
What is *3370# and What Does it Do? According to the email, the secret *3370# code is supposed to improve your phone's battery life. So, if you ever find yourself with very low battery and without a charger at hand, simply press the *3370# keys to activate the secret battery reserve.
Key hardware info: *#0*#
When you enter *#0*# into the phone's dialer, the device enters service mode and brings up a diagnostics menu.
If you want to know if your Android phone is being tracked, look for performance issues such as a rapidly depleting battery or an unusually hot phone. Here's how to check for performance issues that could indicate your phone being tracked: Open Settings > Battery and device care. Tap Battery > View details.
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#*
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.
*#62 is a short code that can be used to check whether your calls have been redirected or diverted without your consent. It does not, however, work on all Android phones.
Call “##004#”
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.
#2 NUMBER IDENTIFICATION: The code *#30# will help you turn your number identification on or off.
Code: *#30#
If the recipient of your calls isn't able to view your mobile number, there might be a problem with your number's Calling Line Presentation. In that case, you can use this code to check if Call Line Presentation is enabled or disabled.
Call Block, otherwise known as Call Screening, is a feature that allows you to block calls from up to 10 phone numbers within your local calling area for a low monthly rate. Turn on: Press *60. If prompted, press 3 to turn the feature on.