How do you block your number when you call someone?
The answer is...
hit *67 before you you type the 1 (if cell phone), area code, and phone 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.
In order to block an outgoing call from a landline, dial *67 at the beginning of the phone number. This will block your number to whatever number you dialed. Your number will not permanently be blocked, so you must dial it at the beginning of every number you dial where you don't want your number to be seen.
In the US and Canada, dialing *67 (or equivalently 1167) will block sending your Caller ID on a per-call basis. However, if you call an emergency number such as 911 or a toll-free number or certain other types of telephone numbers, the call recipient can still see your number by means of Automatic Number Identification (ANI), which you cannot block. Other countries use different codes to block Caller ID.
You are not able to block any phone number manually from any cell phone. You could call your cell phone carrier and ask them to block the phone number for you. You can also put the contact you wish to ignore in a ignore list where your phone will not ring or vibrate when they try to call or text you.