My sister is leaving for Greece tomorrow for a couple of weeks and I'm trying to help her figure out a way for her to keep in touch with her business, me, etc. while she's over there. I was thinking about giving her my old iphone 2G to use but I'm not sure how she would use it. I know that she can use google voice but that would require wifi OR she would have to purchase a local prepaid sim when she got to Greece so that she doesn't have to rely on wifi. She doesn't really want/need a local # while she's there though so having a US # makes more sense. Is there a cheap option for her where she can just get a temporary US# so that she can make calls to (and receive calls from) the US while she's over there? Does Straight Talk or any such company offer a viable option for this situation? The iphone isn't unlocked but I'm pretty sure I can unlock it for her.