Iphone 4s is not so good in performance it has 512 of ram so its not good in speed but good in design and it has older OS version like 9.3.2 and the newest OS version is 10.2.0??. 4s dont have any touch ID you unlock your 4s with passcode.
The important think is it has a good goodwill so the product value is high in market. 12thousand its price so in this price u will get a best android phone thank you