“This phone number cannot be used for verification”
Short answer · The number has reached Google's limit on how many accounts one phone number can create. Google's fix is to use a different number: another mobile number you own, or one from a family member, a friend, or a different carrier. Google doesn't publish the limit or say when it resets.
Error text, declined payments, “not available in your country”, codes that never arrive, usage caps — paste the message and the first screen tells you the most likely cause and what to do first.
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Why Google rejects a phone number during sign-up or sign-in verification, how it differs from "used too many times," and which number to use instead.
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