To forward unanswered calls to another number instead of your voicemail box or answering machine, you would dial *68 and then the forwarding number on most phone systems.
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."
Parked calls that are not picked up after 45 seconds will ring back to the original phone the call was parked from. While on an active call via the handset, speaker, or headset press the Transfer button/soft key. Dial the code *68. Dial the extension of the phone the call is to be parked to.
Call forwarding is disabled by dialing *73. This feature requires a subscription from the telephone company. Also available in some areas is Remote Access to call forwarding, which permit the control over call forwarding from telephones other than the subscriber's telephone.
To deactivate, dial *87. Block your name and number from appearing on caller ID. Outgoing calls will be displayed as Private, Anonymous or Unavailable.
With the *#62# settings interrogation code, you can see if calls or texts are being forwarded to another number whenever you're unreachable. If the "Voice Call Forwarding," "Data Call Forwarding," and "SMS Call Forwarding" all say they're disabled, good. If numbers are listed, they could be put there by someone else.
*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.
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.
*60 - Call Block: Prevents calls from select phone numbers and gives callers a recording that says you're not accepting calls. *67 - Caller ID Block: Hides your phone number on Caller ID systems. *69 - Call Return: Redials the last number that called you.
To bar all incoming calls and texts:
Dial *35*<4-digit code># on your mobile phone and press the call key.
Australia: *10# for Telstra services or *69 on Optus HFC Telephony network. This only allows one to return the last unanswered call, and can cost 35 cents per use.
You have the option to block Caller ID either temporarily or permanently. To block your number from being displayed temporarily for a specific call: Enter *67. Enter the number you wish to call (including area code).
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. That's it, nothing more or less.
*67 dialed by itself or before a phone number string will permanently turn on the Block Caller ID feature. *68 dialed by itself or before a phone number string will permanently turn off the Block Caller ID feature.
Did you know there are similar numbers you can dial to respond to these anonymous callers? The first one is *69, which traces the number of the last person who called you. It works even for anonymous or hidden calls, so you can get the phone number and the exact time they called.
*66: Busy Call Return
The Busy Call Return service allows you to call a busy line over and over automatically for 30 minutes. When the line becomes free, your phone will notify you with a distinctive ring.
Here's how to 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.
Dialing *69 will automatically call back the last number that called you. Keep in mind that this feature may not be available on all cell phone networks, and it may not work for calls that are blocked or private.
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.
*67 - Block phone number on Caller ID systems. *69 - Redial the last number that called you. *70 - Places your call on hold so you can answer another.
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.
When you do not want to be disturbed by incoming calls, you can activate the “Do Not Disturb” feature. All calls will be directed to Voice Mail and you will not hear your phone ring. To activate Do Not Disturb, dial *78.
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. alexialex/shutterstock.
*#*#4636#*#* Displays information about the phone, battery, and various network statistics.
Safaricom PLC on Twitter: "@Tirey_K Hi, to bar All Incoming Calls; Activate barring *33*0000#ok, Deactivate barring #33*0000#ok ^PK" / Twitter.