Phone companies are often quite stupid about letting phone numbers (with their texts) get redirected. Like you don't have to know any private information, just have a good story stupid.
I'd hardly say people routinely bypass Google's two factor authentication (using the smartphone application), which is what I'm suggesting here.
I'm aware of one incident (the Cloudflare hack), but that seemed to be more a vulnerability in the password reset functionality than the authentication mechanism.
whilst this might be true - I get the feeling this is more of a "targeted attacked" - rather than a target of opportunity. 2factor is surely one of the best options we currently have to secure ourselves?