Instruction:

1. Unplug simcard / turn off bluetooth of iphone and turn off bluetooth all near idevices

2. Turn ON WIFI ( but don't input passsword ) => Choose wifi name => click "i" choose Proxy http => choose Manual => Server:  x.x.x.x  => Port: xxxx => Save

3. Comeback to name WIFI u already setup proxy before => input password 

4. Open safari => input: x.x.x.x:xxxx => click fiddler certification => choose install profiles

5. Settings => General => choose Profiles => choose " Do_Not_Trust_FidderRoot" click " install " => click DONE

6. Settings => General => choose About => choose Certificate Trust Setting => choose " Do_not_trust_fiddlerRoot" and click ON

7/ Setting => choose Apple ID => choose iCloud 

=> If u see display Unable Storage => can not removal icloud

=> If u see display Storage iCloud => mean u can removed OFF