How do I update a Microsoft account when it still asks for an old phone number?
Answer
If Microsoft still challenges the old phone number, update Security info while signed in, or add a new sign-in method first; a SIM reseat only helps if the device itself is showing the wrong line number.
Before you start: stop right away if…
- Removing your only verification method before adding a new one can lock you out.
Follow these steps
Add the new number in Microsoft Security info
Sign in at the official Microsoft account site, open Security info or Sign-in options, choose to add a new phone number, and complete the SMS verification.
You should see: The new number appears as a verified method.
Remove or demote the old number
After the new number works, remove the outdated phone number or stop using it as the default verification method.
You should see: Future prompts use the current number.
Reseat the SIM if the phone shows the wrong line
If the device Settings > Phone/About still show the wrong number, power the phone off, remove the SIM for about 30 seconds, reinsert it, and power on.
You should see: The phone reports the correct line number, or the carrier issue becomes clearer.
Recheck the number in phone settings
Open Settings, then Phone or About phone, and confirm the number matches your current cell line before requesting another Microsoft code.
You should see: Device and Microsoft account both point to the same working number.
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Extra tips
What to look for: Microsoft prompts that still list or text the old Phone Number during sign-in
Before you change anything: Stay signed in on a trusted browser session if you still have one. Have the current cell phone nearby for SMS codes. Use only Microsoft’s official account pages. Never read codes aloud to unexpected callers.