WIFI is not always an option ...
Will O2 let UK iPhone users upgrade to the 3G iPhone early?
Quote:
“Usually networks prevent handset upgrades during contract term because the cost of the device is subsidised in line rental over the lifetime of that contract. This is not the case with the iPhone, as all of the handset cost has been paid upfront by the customer at point of sale. If a customer wants to upgrade from the current iPhone to a newer version less than 18 months later, where is the downside for O2? In fact, why not happily upgrade customers to a newer iPhone (taking another small percentage of the hardware sale in the process) and use that opportunity to reset and extend their existing 18 month contract?”
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http://www.pocketpicks.co.uk/latest/...-iphone-early/