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I have created a few Google(Gmail) accounts for separate purposes. I often provide my primary Gmail account and my (only) mobile number as the recovery email and phone number.
My concern is that at some point Google may stop allowing me to use a specific phone/email combo as recovery contact.
Is there a hard limit (preferably documented) on the number of Google accounts that I can create using the same email/phone combo?
If the purpose is solely be used for account recovery purposes, I don't think that there is a limit, by the other hand, the phone number used for account verification purposes certainly has a limit.
From Verify your account
"This phone number cannot be used for verification"
If you see this error message, you'll have to use a different number. In an effort to protect you from abuse, we limit the number of accounts each phone number can create.
Usually Google doesn't reveal limits like this to avoid system abuse.
