For speculators its time to sell but given that the telecommunication industry is at its infant stages selling it at this time does not make any sense.
By June 2009 we had a penetration rate of about 40-50% therefore there is still room for growth in the voice market ,the data market, well its surface has not yet been scratched.
Unless you are selling because of panic I still believe Safaricom hasn't reached its peak yet.
'......to the acknowledgment of the mystery of God, and of the Father, and of Christ; 3 In whom are hid all the treasures of wisdom and knowledge.' Colossians 2:2-3