I'm not sure why you guy's are all revering to network congestion to try and cover for VodaScum & EmptyN. The facts are: There where targets set. All the operators agreed on those targets, saying they where ready to meet those targets, if not better them. Then after the world cup Lied about they're success rate (according to this article).
Another fact CellC have been working on upgrading their network for the last 14 months now, so if their network can support more users than the other two operators don't blame low numbers, saying VodaScum & EmptyN where congested. Then they should have upgraded they're towers & perhaps set-up more, instead of buying that new Merc or BMW.
I also believe that part of CellC's success was because they where busy setting up new Towers & with the World Cup in mind they Placed their towers more strategically to provide better coverage around the stadiums.
Lastly during the World Cup we had 3 Swiss, 3 German & 2 Dutch people staying with us & friends & all of them bought cheap handsets when they landed here with CellC sim cards saying, they left their expensive phones at home because of crime in South Africa.
Doesn't matter which way you look at it, it's another win for Cell C