When first released , the iPhone 6 and iPhone 6 Plus were supplied pre - loaded with iOS 8 , while the iPhone 5S was supplied pre - loaded with iOS 7 .
Head entity: ios 7 Q13426339 30 31
Tail entity: ios 8 Q16973176 17 18
Relation (head \u2192 tail): P156
Inverse relation (tail \u2192 head): P155