I am going away for the weekend and there is not going to be any wifi, but there is a TV. If i setup a hotspot on my Android phone, is it possible for the Playstation 4 to connect to this mobile hotspot and get an internet connection that lets me play multiplayer games?
There is no difference between a wifi hotspot created by a router vs a smartphone. Under the hood there is, but in terms of the devices that consume the wifi connection, they are not concerned with any of this so long as the connection follows the normal protocols. So yes, you can connect the PS4 or pretty much any other device that uses a normal wifi connection to a wifi hotspot created using a smartphone.