How to spoof old phone number?

[vinko]

Google has locked an old Gmail of mine with an old phone number connected. I'm 80% sure I've got the right password but they are still saying they don't have enough information to verify its mine without the phone. Anyone have experience in this area or can direct me to some material on how it can be done? It's very important as I have sentimental emails I need access to. Any help appreciated, thanks