Linking my thinking back to another thread - there's a thread here on the forum about IOS 10 support - and the camera service being affected by the lines on your home page (whatever that happens to be) .... related to the app security settings....
Let me find that post - and I'll refer you to it. I've 'removed' the impacted lines from my home page - and the camera service and the other plugs that run on device ready - now run (and they did not below).
You can tell if this is your issue if you don't find the other thread or don't want to make the changes needlessly - by - once your app starts on the phone - double click the home button (to get the 'pause' event to fire on your home page) and then move to another app - and then double click - and give your app focus (the resume event now fires) - and so will the device ready event - and load your plugins.
Test the camera service - if it works - this is your issue (the security settings on your home page) - and follow the steps on the next post.
Otherwise - well it was a good theory - look forward to hearing what the real issue was/is.