Please make sure you enter your mobile number using your country code followed by your mobile number (removing the 0)
eg For the UK :
Country code = +44
Number = 07497679299
so this would be entered like this: +447497679299
After you have successfully entered your mobile number you receive an SMS with a link. Please note the SMS can take upto 2 minutes.
Click on the link in the SMS and this will validate your number.