Using Outlook for iOS for personal email and calendar management
Hello, thank you for reaching out to Microsoft Q&A.
May I please confirm what you’re trying to change?
- The phone number on your Microsoft account that you use to sign in ("Manage how you sign in to your account" page): https://account.live.com/names/manage (you can use this number to sign in to your account instead of your email address)
OR
- The alternate recovery phone number on your Microsoft account, which is used to verify your identity during the sign-in: https://account.live.com/proofs/Manage (You will receive the SMS Code to confirm your identity)