So is it safe to say that this root method is not fully working and stable, since a lot of people are getting those random reboots.
For the caller ID go to phone the click the 3 dot and look for caller id.
Now for the other one you need app from the playstore called package disabler. It cost you $2, it's worth it. Open that up and look that samsung phone and disable it.
Sorry if this has been asked before, but is there a way to change the shortcuts on the lockscreen?
Yes it has been asked before, yes it has been answered before as well. Long press on the shortcut that you want to change in the lock screen prefere...