I am slightly confused regarding the difference between the tethering and mobile hotspot features on my new Galaxy S5. For example, at my gym there is no wi-fi available for me to use my Kindle reader. With my previous Galaxy S3 all I did was select tethering and then activated wi-fi on my Kindle and all was well. With the S5 I am not sure which I should use to accomplish the same thing. If I select tethering, it brings up a check box for Bluetooth tethering. Or should I turn on Mobile Hotspot instead, then select "Allow all devices to connect."