With ios mobile phone users, some App application software, readily visible on the android system and direct download, and by the App Store nor without trace,
This is because the APP application software didn't do ios enterprise signature
Developers have not learned the ios signature,
01. Market regulation strictly, the app can't shelves in the app Store, need to sign the ios
02. Private application, need ios enterprises signed
03. Ios of the audit process of signature shall not submit App Store
04. Ios enterprise signature can not limit the number of devices use
05. If released to the market, need ios enterprises signed
Through the list above, we can see that the developer or enterprise is a need to ios signature,