Hello, some apps such as Facebook, LINE, Youtube, Instagram, WeChat, Flipboard, QQ, Dropbox, Word, Excel, PowerPoint require the user to log on with an email account. Are these apps automatically executed whenever I turn on/restart the iPhone 6s plus? How can I tell? Do they consume a fair amount of power? Is it a good idea to prevent automatic execution of these apps to save power? If so, how to do it? Thanks.