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From here, you will need to text Facebook a message to prove that it is you. Follow the on-screen instructions.
5. Once you receive a text message back, type in the code in the box provided.
6. Here is the crucial thing. Ensure that the first box is not checked so you do not make your mobile number available to others.
7. If you wish, however, for friends to send messages directly to your mobile, while not disclosing your mobile number, check this box.