How to block my Caller ID on iPhone
In Settings, you can choose to hide your phone number from outgoing calls.
Hide your Caller ID in your iPhone settings
On your iPhone, open the Settings app.
Tap Apps, then tap Phone.
Tap Show My Caller ID, then turn it off. When you make a call, the recipient won't see your phone number.
If Show My Caller ID is dimmed or doesn't appear, contact your carrier.
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