Most smartphones available today offer passcode locks and biometric logins. When setting up your passcode, don’t settle for the four-digit pin. Instead, create a strong password with different alphanumeric characters.
Remember that even with a Touch ID or Face ID, you can still access your phone via passcode. So, if ever someone stole your phone or you lost your phone accidentally, you will have enough time to contact your bank and cancel bank access from your phone.