How come my FaceTime doesn't work?

I have an iphone 5 and my sister has an iphone 5 we live in different states and we both tried to FaceTime for the first time, well it was a complete failure, it didn't work, it wasn't until an hour later all of a sudden it said she was trying to FaceTime and the calling icon popped up, so I guess the real question is can anyone tell me how to fix this problem?

Facetime is a very labored app. It sux a lot of data down. IMessage and Facetime can and do work on Wi-Fi too. Both of you need to attempt Facetime on Wi-Fi and hopefully have better results. Doing it over data can be painful without a full signal. Best luck.

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