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How can I DELETE MY OLD CELL PHONE NUMBER

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I can't get my old cell phone number out of my settings.I need a code to reset my password.I have put my new phone number in but keep getting my code sent to the old cell.Please help!!

I can't get my old cell phone number out of my settings.I need a code to reset my password.I have put my new phone number in but keep getting my code sent to the old cell.Please help!!

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How is that related to Firefox browser support?

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How is that related to Firefox browser support?