My girlfriend is travelling to europe for a month. The 30 days do span between two months. She wants a cell phone for safety and in case she gets separated from the people she is travelling with. I have arranged to get a iphone 3G that is unlocked. She will be using skype to phone back to canada. What would be the cheapest method to get minutes? She won't need a ton of minutes. I have seen some international sims, would those be cheapest? Or would it be better to get a O2 prepaid and roam with it? She won't be needing data for the iPhone. I have seen some people recommend http://www.telestial.com/view_product.php?PRODUCT_ID=MSIM-PP02 What are your thoughts?