Turning off email verification on your iPhone requires disabling two-factor authentication. To do this, open the Settings app and tap your name at the top of the page. On the next page, select ‘Password & Security’ and then toggle off ‘Two-Factor Authentication’. This will turn off email verification for all accounts associated with your device. You may also need to go into each individual account in Settings > Mail > Accounts and disable any additional security measures such as password or PIN verification.