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Blocking your number is the easiest way to call with no caller ID, which prevents the recipient from seeing your number on their display when you phone.

Here’s how to call with no caller ID:
If you only need to block your number one time, dial *67 before entering the phone number
For all other outgoing calls, here’s what to do:
On iPhone, go to Settings > Phone > Show My Caller ID, and toggle it off
On Android, go to Phone App > Settings > More Settings > Caller ID, then select Hide Number

For anyone who might need a more private calling solution altogether, Hushed is a great option to consider. Hushed provides a temporary (or long term) secondary online phone number that allows you to make anonymous calls without revealing your real number.