cheap is expensive.you cant talk with five shilling unless you want to leave the other guy in suspense.
safaricom,most of the time,charges 8/per min so 5/= is less than a minute and if you are talking to someone in the other networks then its better you write a single sms or just say hi,before you are disconnected.
you can achive all things through Him(Jesus Christ)
'......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