I see your point. I don't know anything about the workings of Silent Circle' but if I may be so bold to do some suggestions: A user needs to purchase a certain

I see your point. I don't know anything about the workings of Silent Circle' but if I may be so bold to do some suggestions: A user needs to purchase a certain amount of time (minutes or days) you say. But do they? How about a certain amount of 'connections' or calls? Does it matter how long the conncection lasts? All you log is 'user bought 100 connections' and it took 2 months to use them. Perhaps there is a way to log in the conncections inside the app, locally and not in a central database. You'd hold no information on your side (Missed your reply, HN really needs a notification system!)