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Hi I use a simple solution. My login screen has 3 fields : - username - password - security code From all my users i have a mobile Phone number. When the user logins in then : - i create a random number and save it in a database for this user - i send a tekst sms with this generated number to the users mobile Phone - the user enters this number in the field 'security code' - after entering the security code i check if security code = as stored number in database - if there is a match the login procedure is succesfull ps for sending sms i use bulksms.com, it's quite easy to send sms