To obtain your account number and passcode for porting your number from Project Fi (now called Google Fi), follow these steps:
1. Visit the Project Fi website or open the Project Fi app.
2. Navigate to 'Manage Plan' within your account settings.
3. Choose the option to Cancel Service.
4. Select Transfer your number to another carrier.
By following these steps, you should be able to view your account number and passcode, which you'll need for transferring your number to another carrier.