Two-Factor Authentication (2FA) was introduced as a compulsory authentication mechanism for ensuring the security of the accounts of our clients.

Once you deactivate it, you will need to re-enable it on the same/another device or a different method. 

You need to go to "Settings" to disable SMS 2FA, and press the toggle button. 

You will then need to enter the 6-digit code that was sent to you via SMS.