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How does Apple's mobile phone hide its number and send text messages?

How to set a hidden number in a mobile phone;

Method 1. Phone-More in the upper right corner-Settings-More Settings-Show local numbers-Hide numbers.

Mode 2. Some machines: mobile phone-menu key (or three points in the upper right corner)-settings (call settings)-other settings-caller ID-hidden number.

Note: the hidden number function requires the SIM card of the mobile phone to support this service.