EscapeSIM offers eSIM plans for South Africa that provide data only, without a phone number or SMS capability. There are no plans from this provider that include telephony services for South Africa.
Travelers can use VoIP applications such as WhatsApp, Telegram and iMessage over the data connection to make calls or send messages. However, some destinations may block or restrict access to specific apps or VoIP services, so it is advisable to verify that the applications you rely on are available in South Africa before purchasing a plan.