Currently, we allow eCards to be sent via email, Facebook, or Facebook Messenger. However, we do have a workaround that allows an eCard to be sent over a messenger service like SMS, or WhatsApp.
In order to send an eCard this way, please log into HallmarkeCards.com through the web browser on your phone and send an eCard to yourself. On the confirmation page, you will see a link which you can copy/paste into a text message.
We hope to bring this function to our app in the future.