I want to add Mobile number field to customer registration form. So that user can login with help of email id or mobile number.
https://www.magentocommerce.com/magento-connect/custome-account-profile-13594.html
I have tried this extension but it shows me an error.
I have tried creating simple custom extension "Hello World" but don't have experience to write any useful extension .
Can you please give some idea related to my requirement?