alt Hacker NewsI wish it was. I've looked everywhere for several years for anyone offering this service so I can get into my 2004 Google account that they enabled SMS 2FA on one day, without any notice, but it has the wrong phone number. I have the username, password and the recovery email address is set to another I own too, but without the SMS code I'm hosed.
You should just determine which carrier hosts the phone number and then go get a job there as a customer service agent or store employee. You'll get full permissions to change accounts, so you'll be able to make the change, fix your gmail, then change it back.
You probably risk some legal fallout though, so be cautious.