Archean
Posts: 5,650 +102
If you try to sell your 18-month old phone, you'd get 53% of its original price on average if you have an iPhone, 42% if it's a droid and 41% for a BlackBerry. Check out this graph that shows how quickly smartphones deprecate in value.
I've observed that droids here loose about 50-60% of their value within 12 months of purchase. Whereas iPhone 4, for example, lost about 30-35% of its value in the same period. So this data isn't that far off