I don't have GPT-4, but I thought it was available by default to paid subscribers. Is this not the case? Or is there a waitlist to even become a paid subscriber

I don't have GPT-4, but I thought it was available by default to paid subscribers. Is this not the case? Or is there a waitlist to even become a paid subscriber? Also, does anyone know if Copilot is using GPT-4? I assume it is.