Iphone 4s iphone 5s iphone 6s I did use this all the phones and iphone 4s is not good I buy this phone 1 years ago when its new its good smooth.
And right now after 1 years its not good many defalts in this phone now its slow the battery is not good and after software update its very slow . if u want to buy iphone I suggest u to buy iphone 5s its a very good not so big not so small its a very good size . every body love it .