Iphone4s upgrade ios9 receives the information of 10086 in brackets. What is the reason?

If it is a direct upgrade, it will directly erase the original machine information; If you accept the push update and upgrade, the original mobile phone information (including communication information/contacts, software, etc. ) will not disappear. 1. Although Apple did a long-term internal test and public beta before pushing the official version of iOS 9, after the official version was upgraded, the average user upgraded too many times. ...