The feature for setting identity confirmation, which allows further mechanisms to extend the standard use of email confirmation, is covered in the following sections.
Verifying identity
Enabling the SMS method of identity verification
Setting this option results in users receiving a one-time PIN via SMS to enable the Salesforce security mechanism to verify their identity.
The Enable the SMS method of identity verification option is enabled by default and can only be disabled by a request to Salesforce support. Please note that users have to first record and verify the number for their mobile phone before they can use this feature.