IPhone 4s was a wonderful creation by apple which was destined with a metal coating round the phone which gives an awesome performance from ios 6.1.after 8.1 apple eventually decrease the performance of 4s because people on to upgrade to newer versions. after 4s all the apple versions are so delicate and easily breakable.
There are many new features in new version of I phones like photos, finger print lock, battery backup is more, camera pixels was very high for selfies.more over many people show interest in 4s because of its looking and its quality