I own a Samsung Galaxy SIII, I have recently been having problems with it freezing and apps crashing. My previous phone was and iPhone 4 and never had any issues so I decided to buy an iPhone 4s on amazon. My question is can I put my SIM card from my Galaxy SIII into my iPhone 4s? The reason I am unsure is because the SIII is 4G and the 4s is 3G. I'm not asking if it will make the iPhone 4G because I know that isn't possible I'm just simply asking if my current SIM card will work in the iPhone 4s? Any help appreciated!