Number portability  means  that you can  migrate  your MSISDN  while  you  still keep  your IMSI.  MSISDN  is  the  number  like  0722-XXXXXX
that  is  easy  for  subscribers  to remember. IMSI  is  a number  starting  with 63902  for  Safcom  and  63903  for  Zain  etc. Its  12/14  digits  or  so.
Its   that IMSI  that  is  used by  the network (MSC , IN platform)   to do charging  etc. This  means  that  even  if  your  number (MSISDN)  might look Safcom, you  are actually  a  ZAIN  sub. What  matters is  the IMSI

On Mon, Jul 26, 2010 at 6:47 AM, Dennis Kioko <dmbuvi@gmail.com> wrote:
From the way CCK director Charles Njoroge was saying, it seems that it might be possible to migrate and keep Mpesa on your line. Bank related services should remain intact as they are linked to the line and not network. 
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