Please take note of this links for Bluetooth PAN and Wifi Hotspots...
Install blueman and gnome-bluetooth to do Bluetooth internet sharing from mobile phone.
sudo apt-get install blueman
sudo apt-get install gnome-bluetooth
Go to Network Connection settings and create Bluetooth Settings for mobile phone
On Android Phone, enable mobile hotspot and tethering,bluetooth tethering and select the bluetooth device to connect.
On Apple iphone, mobile data need to be turned on and hotspot need to be enable and select bluetooth settings. It connected via apple iphone mobile data. Not on wifi.