How can I get the phone numbers for google verification?

You can't get phone numbers for google verification I can now send you a code from any number/any name I want and you would probably believe it came from Google. When you try to input the code I sent you to the 2FA it will not work verifying that I am indeed not Google.

EDIT: For anyone reading this in 2020 Google's stock Android sms app(Messages) will now verify who the message is from. If it doesn't say that it is from Google I would suggest that you don't use it and request a new code. Or don't login to that account until things are figured out. Do Google use multiple different phone lines for sending out verification codes Google probably uses a 3rd party service for sending the SMS. Even if they didn't, in order to scale they would need multiple lines since most carriers have SMS limits.