In few of the exchanges or wallets there is a privilege to set SMS or Mail as 2FA. But, I would like to mention that SMS and E-mail are not the correct 2FA to use.
The brutal fact that I wanted to say is the info that is being sent(like SMS or Email) to you is never a proper 2FA it is highly vulnerable. There are apps like authy, Google authenticator which operate offline and are not sent by third party.
This does not mean that Authy or google authenticator can not be hacked. But are more safer than SMS or email authentication.
The above details for those who already know what is 2FA. Rest can read about it below:
What is 2FA?
Two-factor authentication is a form of multifactor authentication. That is you need 2 different factors to login to any of your portal one can be password the other can be a a text message or a one time code etc.,
Why 2FA?
It increases the security of your account. That is even if someone guesses your password it is had to get access to the other factor.
Please enable the 2FA to increase the security of your account. And please do remember that it is better to keep a second factor for which only you have access to.