I've had mine just over a year... and I've used just shy of 3GB.

The question, then, is how much data is enough? I've had a loaner iPhone for a week and have used it non-stop in virtually every conceivable way, fully draining the device's battery each day. I'm particularly enamored by the iPhone's GPS and geo-location ability and am constantly using it to find Tim Hortons and gas stations. I spent the weekend leisurely driving around southern Ontario and the GPS, along with the Safari browser, were absolutely indispensible in finding movie showtimes, driving routes, hotel rates and weather forecasts.

I've used the iPhone to keep tabs on the government's spectrum auction while on my lunch break, to open and read e-mail attachments while on the beach and to show YouTube videos to friends while at the bar. I even managed to achieve the utmost in laziness - I checked baseball scores over the iPhone's browser while sitting on my couch, my computer not more than five feet away. And, in the interest of seeing just how far data allowances go, I did it all using the cellular connection rather than the built-in Wi-Fi.

Lastly, just to check how much data video really does take up, I watched a handful of YouTube videos and found that a five-minute clip tends to use between five and 10MB, depending on the quality, which is far less than than the 50MB to 80MB some analysts had quoted before the new iPhone launched.

At the end of a week, after pushing the iPhone to its limits, my total usage came to a grand total of 86MB. Factored over a month, that will come in well under Rogers' initial cap of 400MB. That said, it's hard to imagine what one would do with 6GB.