We’ve kept you informed about Skype’s video calling on the iPhone this week, and there’s still more to know. Yes, it is available on the iPhone, and yes it works over 3G. The question, however, is just how much of your precious data plan will get used up during a video call, should you choose to chat over a 3G connection.

The answer isn’t terrible, depending on how you look at it. The estimates figured up show about 3.4MB per minute being used during a video call. The test was done by logging the data usage before and after a 1-minute call. If your plan only allows for 200MB per month, you’re going to want to shy away from this feature. However, if you’ve got 2GB to play with, you shouldn’t have too much of a problem.