Your e-mail address if your unique identification used to log into the site. We utilize a user's e-mail address for verification purposes. If a user uses the same e-mail address when they first purchased a card, then they will not have to wait for a call-back verification process.
Therefore, if you change your e-mail address, we most likely will attempt to call you next time you purchase a card for verification purposes.
Upon changing your e-mail address you can continue to use your new e-mail to purchase calling cards without expecting a call-back verification process.