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However, cell phone number are not private but in a year or so you are able to own your own "cell" number and you are allowed to make it private unavailable and so forth.
Sorry to ruin your wonderful wishing. Even if you "own" your own number it will never truly be safe, nothing is. The company has it, it is on your phone records. So somebody can hack into the phone companie records, or bribe a lowly worker. Nothing is truly safe, not even if you are the only person who knows it; a hot metal iron or some heroin concoction can be quite persuasive.