I'm a complete novice when it comes to using technology overseas. My family is travelling to South Africa next month and we'd like to be able to use at least one of our phones during our trip. We have an iphone and a Samsung Android. Being able to make calls would be nice, but access to the internet would be even better (especially since I understand there are ways to make inexpensive int'l phone calls over the internet). We'd also like to download a GPS function for driving. The Adroid is certainly "unlocked" if that helps.
Is there an "easy" way to do this at a cost that makes any sense? Or is this a technological leap too far, and we would need a cheap local phone to make calls -- and just use the internet where we can find wireless access?