@muganda, no interconnection charges in kenya will not be a worl's first. Sri lanka operated with no interconnection charges untill early 2010 when they introduced 0.60 cents charge due to deadly price wars. I'm sure if you dig deeper you will find more countries with no interconnection charges.
Personally i don't see number portability being effective in kenya. There is an article in
business daily concerning number portability.."CCK had initially proposed a reference database fee of Sh1,000 to offset set-up and upgrade costs, but operators have argued that it would itself act as a barrier to subscriber movement.
Other than the registration fee, subscribers will pay an extra Sh2 above the normal tariffs – to offset database query and one time porting or migration costs.
Switch from one network to another will also not be automatic, but will take a maximum of three days.
For example, in Pakistan, Service Provider Number Portability (SPNP) was established in March 2007, but to date only 2.5 million subscribers have ported from a total of 97 million cellphone users."