What a recovery phone number is
A recovery phone number is the one a service uses to send you a code to confirm it's you if you can't log in. It's convenient, and it fails exactly when your SIM fails.
- What it is
- Number for receiving recovery codes
- Since
- Standard practice for years
- Verdict
- Yes, but…
What it is
It's a mobile number you add to your account so the provider can text or call you if you can't log in, or to warn you if it detects a suspicious access attempt. Google, for example, also uses it to confirm the account is really yours.
Don't confuse it with everyday SMS verification: the recovery phone number comes into play specifically when you can no longer log in normally.
Since when
It's a practice as old as email recovery by SMS itself, with no specific launch date: it became standard as providers added alternative contact methods to protect accounts, long before modern two-step verification existed.
Why it's used
Almost everyone has a mobile number on hand, so it's the fastest recovery route to set up. Google points out something important: if you change the number, the change can take up to several days to fully take effect (less if you have a security key or passkey to speed it up), precisely to stop someone from changing it and taking over your account instantly.
The flip side is the usual one: if you lose your phone, you lose the SIM, and if you lose the SIM, the provider sends the code to a number you no longer have access to. And there's one specific mistake that creates a perfect circle: using a virtual number (like a Google Voice one) as the recovery phone for the same account that manages it. To recover the account you'd need a code only that same account can give you.
Do we use it?
Yes, as one route, never as the only one. It depends on the SIM, and the SIM is exactly what you most easily lose along with your phone.
Check this
- Is your recovery phone number a physical number, not a virtual one tied to the same account?
- Do you have another recovery route (email, backup codes) that doesn't depend on your phone?
- Do you know whether your carrier could give that number to someone else before you noticed?
Official source: Google Help: account recovery information