Hi my name us nasim I just updated my iphone 5s to IOS 9.3.3 and the first thing happned was my rear cam stoped working so I thought to wait for new update and my friends updated to ios 9.3.4 to iphone 6 / 6s and they also started havibg problems as they can not do a snap shot of their screen and there is a problem with wifi connection its takes too much time to connect so I sugest not to upgrade to these ios for now hope this info is help full for you