I spend most of the season near Victoria Falls in the Matetsi Safari area. I have a Blackberry with T-Mobile. The international calling plan allows for calls to be made and received just fine in and around Vic Falls. There is one high hill on the concession that allows for calls. With this being said, the minutes are expensive, around four dollars per minute. You can also add international texting which seems to be easier and is only .05 cents a text. Much more economical. In short, there are a lot of remote areas throughout Africa that have good cell coverage. Be sure to turn off your voicemail feature! If someone calls you when in Africa you are charged even if you do not answer but the call goes into your voicemail.