On the site you can find a report by Analysys Mason that describes the situation with regards to mobile termination tariffs in Canada, HongKong, Singapore and the USA. http://www.ofcom.org.uk/
One of the interesting conclusions is, that for elements like penetration it doesn't really seem to matter which tariff scheme is used, but it does affect the usage of mobile telephony.
Also have a look at Sri Lanka, the only country to have decided to go to CPP, but decided not to after a wave of protest in the country on the issue. http://www.trc.gov.lk/images/