Why is the penetration rate of GSM in France is so low (about 80%), lower than many countries in Europe?

Question

Cf Study
http://www.journaldunet.com/0305/030520artmobiles.shtml

Answer 1

One of the reasons is that the penetration rate is artificially high in other countries! In many countries, the market is dominated by prepaid offers, this means that many people have at least 2 or 3 active SIM cards and switch among them according to rates and promotions. On the other hand, in France, the market consists for a big majority in postpaid offers, so French users generally have only one SIM card. Finally, France is one of the leading countries worldwide for IP telephony, and most operators offer for €30/month illimited phone calls to land lines in France, Europe and North America.