Please keep your email address and password secure. Consider writing them down and keeping them in two secure locations. If you forget your email address or password, or if someone else logs in using your information, you will be unable to access your account. That means you could be locked out of other accounts that rely on that email address, such as your smartphone, bank accounts, streaming subscriptions, job application websites, or someone could use your account to steal and use your personal/financial data.
Some email accounts employ two factor authentication, which means you must use the same phone number you used to create/sign up for the account in order to log in, recover, or access the email account.
How can I verify my Gmail account without my old phone?