This question gives useful information on iOS 4.3 support. However is there a publicly available policy for future iOS versions on which devices they will support? For example, do they always support two previous generations of hardware, or does it vary according to each release?
If there is no official policy, what does the trend seem to be?
Best Answer
John Gruber summarized all sane observations about the iPhone lifecycle (part “THE IPHONE PRODUCT CYCLE”).
In short, the trend seems to be of two generations support for older devices:
Apple of course does not have any official policy about that, as for anything that would approach roadmapping.