i think what "abhijeet1982" is referring to is the hardware refresh interval that apple have, you can be sure that in most cases apple will refresh their hardware once (at most twice) in a year, and the most up-to-date version of the iOS will work in several generations of the product at once, i.e. ipod touch gen2 and 3 can utilise iOS 4, the iphone 3g, 3gs, and 4 can all utilise iOS 4...
with the android equipped phones, there are that many of them from that many different manufacturers that there's a new one coming out every other week which is better than the one you've just paid for, which on the one hand is great for progress, but lets face it, pretty rubbish for folks who have just paid out for it (and are invariably locked into a 2 year contract) so they are stuck out of date almost from the get-go for 2 years....!
this wouldn't be so bad if you didn't add in that a lot of these phones are very very slow at getting a major android update made available for them (if ever)... as the manufacturers don't really want their "old" (6 months is old...!) phones getting the same software as their newer more shiny ones.... it's a shame really..
apple do seem to provide more longevity with their hardware revisions, and because their prices are in orbit (and always remain in orbit).... there is actually a viable second hand market for older apple devices, in the uk, just check what prices o2 are willing to give you for an iphone 3g or 3gs on the o2 recycle website.... compared to older android based phones...
as this is a tablet article, i do hope the android tablets are more aggressive with their upgrade process (software wise) and the manufacturers don't saturate the market with lots of hardware revisions, as once you've got your tablet, as long as it plays media, browses the web and reads email and docs ok, you don't really need faster and better ones.....! so hopefully your hardware investment will last a good length longer than your typical mobile phone ownership....
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