How can I locate if a player is playing through the mobile app because I want ti load 2 diffrent gyis to fit the screens of the user either a mobile or PC and hiw would that happen? First I need to know how to locate what the device the player is using then how to load either one or the other guis.
If I were you, don't use a GUI to ask. Simply use UserInputService.
if game:GetService("UserInputService").TouchEnabled == true then --do mobile stuff here end
Give them a gui that askes them. Are you on iOS or Computor? If they click one, give them the correct guis.