South Africa has four major cell phone networks: Vodacom, MTN, Cell C and Telkom Mobile and each offers pay-as-you-go packages.To save money on your roaming charges it can be worthwhile to get a local pay-as-you-go SIM card which you can then top up with airtime for calling and texting and data for using the internet on your smart phone. The big cellphone networks all have stores in the city’s major shopping centres and malls.
Note that to purchase and register a South African SIM card you will need to show your passport and a proof of address (a booking confirmation from your hotel or guesthouse will usually suffice). An increasing number of cafés and restaurants offer free wi-fi along with hotels and other accommodation establishments. The City of Joburg has also installed hundreds of free wi-fi hotspots in public places such as stations, community centres, schools and libraries.