U obou asi o dost méně než u Androidu.
http://blog.amplifiedanalytics.com/wp-content/uploads/2012/07/CSI-by-OS-Q2-12.png
'...the return rate on some Android devices is between 30 and 40 percent, in comparison to the iPhone 4′s 1.7% return rate...'
http://techcrunch.com/2011/07/26/androids-dirty-secret-shipping-numbers-are-strong-but-returns-are-30-40/