You can always opt to dial *67 before your recipient's # to block your caller ID or *87 to unblock it.
Use *67 to hide your phone number
The free process hides your number, which will show up on the other end as “Private” or “Blocked” when reading on caller ID. You will have to dial *67 each time you want your number blocked.
How do I unblock Caller ID to a certain number? To deactivate Caller ID Blocking for a specific number: Enter *82.
It's surprisingly simple: The moment you dial *67, your phone sends a signal to your provider requesting a caller ID block. From that point forward, your outgoing calls become shrouded in mystery, appearing as "private" or a "blocked number" on the recipient's end.
Star 69 refers to "last-call return," the Calling Feature Vertical service code *69 keyed on a landline telephone set in order to return the call of the last one to ring (in Canada and the United States).
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.
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.
*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.
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."
It allows you to easily trace calls made to your phone number. Essentially, *57 records the calling number and other identifying information such as the date and time of the call. This information can then be used to request a complaint with your phone provider or to report the call to law enforcement.
The caller will hear a message stating that the line does not accept calls from blocked numbers. To activate, dial *77. To deactivate, dial *87. Block your name and number from appearing on caller ID.
Android, flip phones and home phones:
Access your voicemail box by dialing *86, your 10-digit number or long press 1. Choose English or Spanish as your language preference.
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#.
There is no charge for using Per-Call Blocking. Per-Call Blocking is automatically available to you. There is no need to add this feature to your account. For permanent blocking of your Caller ID information, please contact us at 800.288.
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.
Prevent calls from callers who block their Caller ID information. Dial *77# Dial *87# Caller ID. Display your Caller ID information when you make an outgoing call.
*89 to cancel a Call Return request. *66 to monitor a busy line and inform you when it's free.
*65 Activation, *85 Deactivation - Calling Number Delivery - Provides the subscriber with the directory number (DN) of the calling party during the ringing cycle.
Key hardware info: *#0*#
When you enter *#0*# into the phone's dialer, the device enters service mode and brings up a diagnostics menu.
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.
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#*
*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.
Common “star codes”
*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. *72 - Forward your call to another phone 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.