To turn off caller ID, open Settings, tap Applications, and then tap Phone. Locate and tap More Settings. Tap Caller ID. And select Hide Number.
To block caller ID for an individual call, dial 1831 (or #31# from a mobile) then the number you are calling. Generally, this will make sure the person you are calling will not see your number.
Dial *67 Before the Number You Want to Call
The simplest way to block your number is to add *67 to the beginning of the phone number you want to call. If you use this method to hide your caller ID from someone saved in your contacts, you'll need to make a note of their number (or copy it to the clipboard) first.
To turn off caller ID, open Settings, tap Applications, and then tap Phone. Locate and tap More Settings. Tap Caller ID. And select Hide Number.
*31# (Disable Caller ID)
If you want to keep your privacy and prevent others from knowing when you call them, you can disable caller ID by using this code.
While using *67 works on smartphones, it must be entered each time you dial a number. Most cellular carriers offer a way to block your number on all outgoing calls using the Android or iOS device settings.
Do you want to hide your caller ID when you place a call using your Android phone? If you only want to block your caller ID for a single call, you can dial "*67" before entering the number. You can also hide your name and number for all calls in in the Settings menu of your Phone app, or by using Google Voice.
To find these options, open the Phone app on your Android, tap the "More" icon (3 dots) in the upper-right corner of the screen, select "Settings," and then "Call Settings." Next, tap "Additional Settings" and then finally select "Caller ID."
This Vertical Service Code, *82, enables calling line identification regardless of subscriber preference, dialed to unblock withheld numbers (private callers) in the U.S. on a per-call basis.
It sounds like the person you are calling may be blocking restricted calls, so you can not call them anonymously. If you must call the person, try calling them without using *67 so that your number shows up on their Caller-ID.
Key hardware info: *#0*#
When you enter *#0*# into the phone's dialer, the device enters service mode and brings up a diagnostics menu.
The *#9900# code is a diagnostic mode code for Samsung mobile devices. It can be used to access a variety of system information and diagnostic tools, such as enabling/disabling fast dormancy, logging options, and system dump mode.
Security of Android Smartphone codes : Code ## 002 # ~ Deactivates all forwarding. Code * # 21 # ~ To know whether message or call has been diverted or not.
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#*
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.