What sort of tracking methods does vodafone have to track the number of cellphones using a particular tower? Can you actually see how many cellphones are connected to it when they are not making/receiving any calls or texts? Could you actually see how many cellphones are connected to your network all over new zealand and is it as easy as clicking a few buttons to see this info? And does vodafone's gsm 2g have 124 carrier frequencies and use time division multiplexing which would mean each tower can handle 992 simultaneous voice calls? Does the call limit increase with 3g?