True, but this needs to be done by households. There are 20 million residences in the UK, and I dunno, maybe 10 million business lines. Probably more.
30 million active lines gives you 200,000 households/businesses per telco. Telkom only have about 1 million active lines (altough I read somewhere it was 500,000), so the thought about dividing Telkom into 4 telcos was about right looking at the UK ratios.