Easiest two factor verification method (sending verification codes to cell phones)

1. What is the best method of two-factor authentication?
2. How do you automate 2-step verification?
3. Why is my 2-step verification not sending code?

What is the best method of two-factor authentication?

Hardware-based 2FA

Using a separate piece of hardware like an authenticator device or a U2F security key is the best way to secure any online account.

How do you automate 2-step verification?

To automate an email account protected with two-step verification, you need to create an app password. App passwords are randomly generated passwords that can be used only once when you sign in to an application or device that doesn't support two-step verification.

Why is my 2-step verification not sending code?

I'm not receiving a verification code

Check that your phone software is up to date. Disable any apps filtering or interfering with incoming SMS messages. Restart your phone and try resending the 2SV code. Verify that your device has notifications turned on.