When activating the SMS integration, you can setup additional login security, by using SMS code when logging in to webCRM. Go to Configuration --> Integration --> SMS, and make sure the settings are set to Broadcast + Individual messages.

If an SMS provider is activated, you can edit an User and activate Login using SMS code. Go to Configuration --> Users and make sure there is an active mobilenumber on the User, and set the Login with SMS code to Always.

From now on the User will be met with this page, when trying to login to webCRM:

You have 4 tries, to get the SMS code correct, and hereafter a new code will be sent by SMS.
​
​NOTICE: Especially on some networks, there might be delays on the arrival of the SMS.