Naam ki he Hongi bro. I kept 3gs from 2009-2013 and it didn't even run viber properly and got stuck in text message app.
Moreover 90 percent of the old iPhones in then market have dead batteries. That's why I suggested against them because it won't sell easily.
Better go for Q mobile a600, a500, a900 in 7-8k range. Affordable, usable and resalable.
Sent from my Galaxy S5