Send (Transfer) Money
http://www.safaricom.co.ke/index.php?id=268
You can send or transfer money to any other mobile phone user, even if they are not a Safaricom subscriber. To send money you must first deposit cash into your own M-PESA account.

To send money, go to the ‘Safaricom’ menu and select ‘M-PESA’

* Select ‘Send Money’
* Enter your recipient’s phone number, the amount you wish to send and your PIN.
* You will receive a screen with the information you have entered above, (e.g. Send money to 0721 234567, Ksh2000) confirm that it is correct then Press Ok.
* You and the recipient will receive an SMS confirming the transaction.