how much money you earn for a smartphone that already outdated?

with the development of the world of gadgets, emerging products with better features and more powerful. if you have an old smartphone, How much money would you get if you sell it? surely there will be a very significant price difference while you bought it.

This price decline is caused by the discharge of a late model such as 3G or 3G. 4G iphone iphone will shift earlier. Decide if you sell it to you Should Consider timing, condition and accessibility if You Want to sell your older devices at the highest price.