Will be heading to mexico for a bit. I have an unlocked iphone 4s. I will definitely get a sim card and data plan in mexico and i read telcel is the company that i should sign up for when i get there. However i heard one could make phone calls with skype as long as you have data. Can someone tell me how this works? First off, i would need a skype number right? And i have to pay for this and its a 1 time fee or yearly fee? Do i need to create this number before i leave the usa? At the moment i dont have a carrier with my phone as it doesnt have any service. So when i get to mexico, i would use the hotel wifi in the meanntime until i go and get data. Then when i do get a plan, im sure it wont have minutes to the usa so i figure best option is to use the data or use my computer to call back to the usa right? I believe its a few cents a minute only?