does anyone here use an international Samsung ativ s for at&t and if they do has any of you tried to use internet sharing? and what happens when you do? does at&t block you? i am using an international titan and by changing the registry i can create a mobile hotspot no problem, but with windows phone 8 locked down i don't have access, so does anyone have the ativ s and can confirm they can use it as a hotspot for at&t?