[cube00]

>find someone else to help you verify with their phone number

Very risky, either of you gets banned (it's a risk given now ban happy Google are) you'll both lose your accounts.

[chrsstrm]

The number is not associated with your account, it is just used to verify legit account creations. Retroactively nuking an account due to using a "banned" phone for account creation verification would be wild and not in Google's best interests.

[fireant]

You can totally get a random "we've detected a suspicious activity, please verify the phone number you've used during registration" form during login.