Vodacom recently experienced problems whereby the Blackberry users and customers that did SIM migrations were majorly affected. Mostly, the coastal areas and Gauteng was affected, the customer care first received few complains but then realized that this problem is on a major scale. The reason why the Blackberry network was affected is because the microwave link experienced downtime in Sandton.
The HLR is a database that keeps details of mobile phone subscribers authorized to use Vodacom’s network, one of the databases responsible for SIM migrations had downtime which triggered problems for the coastal Vodacom users. The solution to this HLR problem is to restart your your device.