How to continue the relation??

I think that in today's technological world, there's no reason to not communicate frequently throughout the day, even if both members of the relationship are in different places. Between e-mail, cell phones, text-messaging, webcams, instant messaging and more, it's fairly easy to connect with someone just about anywhere in the world. I think as long as both parties are willing to set aside a bit of time out of their days to communicate, the relationship can work just fine.

probably I would call once a day

First of all you should have discussed how often you were going to talk each day. If you haven't call the person and set guidelines. With all the meens of communication, it is easy to communate daily if need be.