South Africa has
Prepaid SIMCards: A South African SIMCard will require a SIM-unlocked GSM cell phone that supports the 900 frequency. SIMcards are available in almost all shops & malls and cost you between R1 to R3. This in not includung preloaded airtime obviously. So called "recharge vouchers" are available in almost all shops (checkout counter) as well. If your phone is not working on the South African GSM frequency, you can easily buy a cheap one in the shops. See the websites of the four providers for current rates. You should get a phone for around R300. As of 01 July 2009 all SIMcards in South Africa require to be registered. Click here to read what to do.
International calls: Calling overseas from your South African simcard will cost you a fortune. Rather make use of skype - it will safe you a lot!