some land line phone companies allow you to block all private or unknown numbers......If you can check your account from your computer you can do it that way or call your phone company. As far as cell phones Im unsure.
To change your phone number to unknown or block your caller ID, you can typically dial *67 before the number you wish to call. This prevents your number from being displayed on the recipient's caller ID. Additionally, you can adjust settings in your phone or contact your mobile carrier for options to permanently block your number. Keep in mind that some recipients may still see your number depending on their phone service.
Star 67 is a feature on some phone systems that allows the caller to block the display of their phone number when making a call. By dialing *67 before dialing the recipient's phone number, the recipient will see "Private Number" or "Unknown Caller" on their caller ID.
Call it from an "unknown" (blocked number) or from a different number.
Your phone carrier will block it for you, you just have to go to the store and ask them to block it or you could call them depending on the network
For cell phones call from the cell phone 888-3821222
In order to block your phone number when dialing out, you must first press *67, and then dial the number. This allows you to call someone without your phone number being available to the person you are calling.
When no one answer your phone call block it do *67 and whatever the number is or you could use a different phone
To block a number on 'at' - you have to call your credit number, and you credit number should give you some options. It should say, and for anything else please press (for example) 4. Press this, then press 5. And it will ask you if you want to unlock your phone, or block a number. Press 2 to block a number, then click options, keypad, type in number, then you click phonebook, and click the number you want to block. Then give your details to pay £5 Or $7 to block a number. :] Hope This Helps!
To avoid unnecessary calls from telemarketers, register your number in the "do not call registry list" and to avoid the unnecessary calls from unknown numbers use call barring system and block those numbers.
YOu can get the app Mr. Number
You can call someone without showing your own number by dialing star symbol67 before you dial the phone number you wish to call. this blocks your number just on this call, not permanently. If you want to block your number permanently go into your phone's menu settings and look for the option to block your number.
Telecom call *123 and ask them Vodafone call 0124 before the number