When I turn on Airplane Mode it shuts off the networks. When I press the Wifi toggle in the notification pull down, it connects to wifi while still in Airplane Mode.
There's 2 different descriptions on that page from what I can tell. The description near the beginning of the page doesn't mention 2100, but the lower one way down does. 2100 would be 4G I believe, but the phone only mentions receiving 2G/3G.
I don't see where the phone is 2100 frequency in it's specs. Looks like it supports only 2g/3g and no 4g.
Try going into your Settings>Connections>More Networks>Mobile Networks>Network Mode
I am Using the free Nova Launcher and noticed this as well. The Email, Msg, etc icons never show a number of missed notifications anymore. They do show up in the notification bar, but nothing on the icons in the home screen
Try to manage your google account as well under Settings>Accounts>Google. From there you can set additional syncing or non-syncing settings. Try turning off location reporting etc.