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They do it for suspicious accts as well as new accts. Had one of my gmail accts that is about 5 years old require verification as apparently someone had hacked it and sent out about 100 spam emails. Verified via text message then was taken to the change password screen.
I have also used this same number to verify multiple gmail accts so I am not sure why you would need more than 1 number for verifying gmail accts unless you were upto something they do not approve of.
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