I want to withhold my phone number from contacts that aren't in my address book.

So if I phone a friend they can see its me..... if i'm phoning a stranger they don't get my number...

Is there any way to do this?

would be a neat app if there is one like this

Odd s are strangers will not be in your address book, correct?
Per: privacyrights.org/fs/fs19-cid.htm

"To block your phone number or name from appearing on a recipient’s Caller ID unit on a single phone call, dial *67 before dialing the phone number. Your number ordinarily will not be sent to the other party. (See exceptions below.) But you must redial *67 each time you place another call.
Several exceptions exist to the FCC blocking rules:

800 number/toll-free calls. You are not able to prevent the display of your phone number when you call 800, 866, 877, 888, and 900 numbers. The called party, which pays for the call, may be able to identify your phone number using Automatic Number Identification (ANI) technology. FCC rules, however, limit parties that own toll-free numbers from distributing the numbers identified through ANI.

Emergency services. Calls to emergency lines — like 911 — are exempted from federal Caller ID rules. When you call emergency numbers, your phone number is transmitted even if you have Per-Line Blocking. In fact, the display device used by emergency services usually shows not only your phone number, but also your address so that police, fire and ambulance services can locate you in case you’re unable to provide the address. "

Works for me.
.
.

Odds are strangers will not be in your address book, correct?
Per: privacyrights.org/fs/fs19-cid.htm

"To block your phone number or name from appearing on a recipient’s Caller ID unit on a single phone call, dial *67 before dialing the phone number. Your number ordinarily will not be sent to the other party. (See exceptions below.) But you must redial *67 each time you place another call.
Several exceptions exist to the FCC blocking rules:

800 number/toll-free calls. You are not able to prevent the display of your phone number when you call 800, 866, 877, 888, and 900 numbers. The called party, which pays for the call, may be able to identify your phone number using Automatic Number Identification (ANI) technology. FCC rules, however, limit parties that own toll-free numbers from distributing the numbers identified through ANI.

Emergency services. Calls to emergency lines — like 911 — are exempted from federal Caller ID rules. When you call emergency numbers, your phone number is transmitted even if you have Per-Line Blocking. In fact, the display device used by emergency services usually shows not only your phone number, but also your address so that police, fire and ambulance services can locate you in case you’re unable to provide the address. "

.

Google Search=selective call blocking
.

That's not what i meant..

I would as a default like to withhold my number when making calls. But i'd like the option to show my number to contacts... so they know im calling.

I guess I want to totally withhold my number... and then give my entire address book an exceptional opt-out. No apps for this?