And why might I want one....
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.or,
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Why might I think it an expensive, shiny toy....
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Have always fancied an iphone, but wouldn't sign up to O2. Now that Orange are offering them I can upgrade my existing phone to an iphone, but have as many questions as answers!
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My main question comes down to operating cost - and not just the fixed contract charges, but whether the 3G data costs are going to be prohibitive.
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Sales person could't answer me a vital question regarding the iphone 3GS and (esp) GPS - does the phone need phone network coverage to operate the GPS app. Experience with "normal" GPS units says no - because it is reliant only on loS with the GPS satellite constellation, but some folks have told me that the iphone needs to be able to get phone coverage to access maps to go with the GPS app.....!
If so - a) it's likely going to be sh!te for many of the palces that I would want to go.... and b) going to get bloody expensive if the thing is always looking to dial home for more data (and this question applies to all apps - not just GPS)
So for those that have them - convince me that it is a useful shiny toy, or confirm my prejudice against something (else) that is going to drain my wallet.

