Ok Im going to buy the new 4s but Im still trying to decide which carrier to use. I currently have the iphone 4 on ATT with an unlimited plan but I dont get a decent 3g signal where I work. The people with verizon phones get a much better 3g signal. Im not very knowledgeable when it comes to networks but if I had a world phone will I be able to get a better 3g signal? Or am I going to have to switch carriers?