I'am from Canada and will be going to the US soon. Looking to buy an H2O Sim on Amazon. I have an Unlocked 4S. Are their SIMs, MicroSIMs? Or will I need to cut to fit? Im pretty sure Iam just going to use Data as I have Skype and such. When I activate the SIM will it work no problem or will I have to change carrier settings within my 4S? Another option I was thinking is just a iPad Data Plan from ATT but I won't be letting them know its for my iPhone Any opinions would be great.