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Add or change your phone number
You can add new phone numbers, or update existing numbers, from the Additional security verification page. Microsoft strongly recommends that you add a secondary phone number to help prevent being locked out of your account if your primary phone is lost or stolen, or if you get a new phone and no longer have your original, primary phone number.
To change your phone numbers
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Navigate to the Additional Security Verification Page
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Sign in with your network credentials
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From the How would you like to respond? section of the Additional security verification page., update the phone number information for your Authentication phone (your primary mobile device) and your Office phone.
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Select the box next to the Alternate authentication phone option, and then type in a secondary phone number where you can receive phone calls if you can't access your primary device.
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Select Save.
