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Industry operators have warned that the MSISDN stream - which allows visitors to register MSISDN when visiting a mobile site - may be behind a series of unauthorised billing of South African mobile phone users. Mobile operators, however, say this is not the case.

Many mobile users in South Africa have complained that wireless application service providers ("wasps") are billing their accounts (SIM) without their permission.

These users claim that they never subscribed to a paid SMS service and definitely did not receive a double confirmation message to confirm their subscription.

This raises the question of how these WASPs have access to mobile subscriber numbers and invoice them without following the double opt-in rules.

According to well-placed players in the industry, who asked not to be named, some WASPs are recording details of visitors to their mobile websites.

This mobile information is used to subscribe people to their payment services - often without their knowledge. The billing is usually recurrent: daily, weekly or monthly.

"I think the MSISDN pass was silently powered up for a number of wasps when double opt-in was introduced," said one industry player. "This was probably to compensate them - and the network - for the loss of revenue."

According to the industry source the wasps were allowed to bill SIMs based on a subscriber by clicking on the website buttons, without any SMS dialog taking place.

MTN, Cell on unauthorised billing, MSISDN transfer

MTN, Cell C and Telkom Mobile were asked about possible unauthorised billing by sending MSISDN and exchanging MSISDN.

Cell C - no comments
MTN - no comments
Therefore, it is unclear whether MTN and Cell C subscribers are vulnerable to this unauthorised billing.

It is also unclear whether subscribers can protect themselves against unauthorised billing of WASPs through these channels.