A:AnswerThis is true. To see if your phone is compatible do the following:
Go to Settings, then Application Manager, then All Apps.
You should see something called GearVR (or similar) in the list if your phone has been updated to use GearVR.
A:AnswerThe headset uses a standard micro usb to interface with the phone. The port on the bottom is usb-c. So i think it all depends on ur OS version as well as samsung gear vr software. Also the phone size matters. It doesn't appear so.
A:AnswerHello! We appreciate your interest in our products.The compatible Samsung devices are the Note7,S7, S7edge, Note5,S6edge+,S6,S6 edge We hope this answers your question and helps you with your purchase decision. ^Rod
A:AnswerI am not aware of any case that can stay on. The VR headset is pretty tight. Also, the phone gets very warm so you would not really want to leave a case on.