I'v heard that one of the reasons why robots go out of order in the new SA is because they are controlled from a central point and the reasons for this is that then they can be adjusted for the traffic flow at peak times etc. (Pre 1994, there were no such things as SIM cards and the robots were programmed to work in a sequence until they packed up). In order to do this, signals are sent to a control box which uses a SIM card the same as a cell phone. The only difference with these SIM cards is that they only carry (transmit) data and no voice information. Now when the lowlifes decide to steal the SIM card (for whatever reason - it's apparently pointless as they will not work in a cell phone), this is when the robots 'go on the blink'. As soon as the SIM card is replaced, the affected robot functions properly again.
Is this 'urban legend' or is there some truth in this scenario?