“Bill shock” is a growing problem for SA travellers. They go overseas, and, before they know it, they’ve run up a bill of thousands of rand without even making a phone call. The problem is, as with roaming voice charges, the mobile operators impose exorbitant fees for roaming data – in some cases, more than R100 000/GB. And with smartphones, which are constantly polling the network looking for updates to e-mail and other services, consumers can quickly run up monster-sized