Use *67. This trick works for smartphones and landlines. Open your phone's keypad and dial * - 6 - 7, followed by the number you're trying to call.
Hide your caller ID for individual calls
Enter the prefix used to block your caller ID. This prefix depends on the country or region that your Google Voice number is from. For example, if your Google Voice number is from the US, your prefix is '*67'. You always use the same prefix for all numbers that you call.
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.
Yes, you can withhold your number to make anonymous calls on a per call basis by dialing 141 before the number you want to call. See more information above under anonymous calls.
*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.
Hide your Caller ID in Settings by going to "Phone > Show my Caller ID" and switching it off. If you want to change your Caller ID instead, you need to contact your carrier. To contact your carrier, you can use the website, the mobile app, or call them.
When is spoofing illegal? Under the Truth in Caller ID Act, FCC rules prohibit anyone from transmitting misleading or inaccurate caller ID information with the intent to defraud, cause harm or wrongly obtain anything of value. Anyone who is illegally spoofing can face penalties of up to $10,000 for each violation.
Enter *67 before the entire number, then press the call button. If you can, make a test call (to a trusted friend or coworker) before calling your contact to make sure this works. If it doesn't work, try entering #31# before typing in the phone number.
*#9900# Opens up system dump mode.
Safaricom PLC on Twitter: "@Tirey_K Hi, to bar All Incoming Calls; Activate barring *33*0000#ok, Deactivate barring #33*0000#ok ^PK" / Twitter.
“*#62# is the code to check call diverts, otherwise known as call forwarding, while ##002# is the code to check to cancel it,” the message reads.
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.
To program your Speed Calling 8 list, dial *74. Listen for the dialtone, then dial the one-digit number (2 through 9) you would like to use to dial a frequently called number.
##002# - If your voice call or data call, or SMS call has been forwarded, dialling this USSD code will erase them.
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.
Code to check if phone is tapped: *#21# Code to show unknown connections and tracking (for Android): *#*#4636#*#* or *#*#197328640#*#*
It's called the System UI Tuner and it can be used for customizing an Android gadget's status bar, clock and app notification settings. Introduced in Android Marshmallow, this experimental menu is hidden but it's not difficult to find. Once you get to it, you'll wish you knew about it sooner.
*66: Busy Call Return
This service is optional. Subscription fees apply. To use the Busy Call Return feature: Call the number. Hang up when you hear the busy signal.
Call return (*69) automatically dials your last incoming call, whether the call was answered, unanswered or busy. Call within 30 minutes, during which you can still make and receive calls. To deactivate while waiting for the party you are trying to reach to become available, dial *89.
Under the Truth in Caller ID Act, FCC rules prohibit any person or entity from transmitting misleading or inaccurate caller ID information with the intent to defraud, cause harm, or wrongly obtain anything of value. If no harm is intended or caused, spoofing is not illegal.