I think the biggest issue is cost. 

Orange have to really think hard if they want to keep investing in a GSM network and a separate CDMA network. Guess GSM is cheaper due to more users. 
It also reduces needing to have two (or three of everything including landlines). 

On Thu, 2 Apr 2015 at 13:08 Tony Likhanga via skunkworks <skunkworks@lists.my.co.ke> wrote:
A whole load of info is packed into that innocent looking 16-digit number....

Light read ~~~> http://policeanalyst.com/analyzing-cell-phones-through-imei-numbers/
Heavier read ~~~> http://www.gsma.com/newsroom/wp-content/uploads/2012/06/ts0660tacallocationprocessapproved.pdf

This however doesn't  rule out the possibility that there are other alternative ways of telling apart devices (including #AfricanChemistry )

Tony.
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