If you don't want your number to be visible to the call recipient, there is a code for it, as many secret codes. If you are dialing someone's number from your phone and want your number to be secret, dial # 31 # before dialing the number and then dial the number and then see its perfection.
The caller will have a secret code or private number written in place of your number and will be your number. But in this regard, make sure that the number of the person you are calling is not saved on your phone, otherwise, it will not be possible.
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technology