iPhone - Changing Bundle identifier : what will happen?

What may happen if I change my app bundle identifier ?

For example, if I go from com.myapps.appname to com.myapps.utilities.appname, or com.myapps.appname.appnameFULL

What m开发者_开发知识库ay happen for people who have already bought the app ?

What may happen with stored datas ?

...

---

You will not be allowed to change it in iTunesConnect so there is no ramification as there is no possible way to do it. If you create a new app with a new bundle id, obviously old users of the other app will not get the updates. See this related question