verified phone number linked to google 2 step verification

That has NOTHING to do with AT&T. 

Talk to Google. 

Unless you recently gave up your number and can recover it by reactivating your previous service, there is absolutely nothing AT&T can do.

AT&T is not Google.

Well that's inconvenient. 

And? 

You are posting on a community forum. Is there a question or are you just making an observation?

🤔

i need to know how to access my google account if i dont have the phone number linked to the 2 step verification 

again contact google