Here's how you can monitor how much data FaceTime is consuming on your iOS device. This can be very important if you are using FaceTime over a cellular network, it can save you money on data usage.
1. Go to Phone app on the iPhone, or the FaceTime app on iPad or iPod.
2. Tap the blue arrow by the recent call entry.
3. You'll see the detail view that shows how much data was used by FaceTime.
Why pay higher data usage bills because of FaceTime? Keep tabs on it, and save yourself some money.
Read more: iLounge