Simple Mobile Phone Dialer

We are a small company in Greece which needs an application developed for Symbian, Windows Mobile and iPhone. The features should be simple. The application should dial a pre-configured (by the user) number (e.g. 555) and then the phone number the user dials by hand or through his contact list. (In fact it redirectes the called number through the pre-configured) To make myself better understood, we need: 1. A menu where the user can enter the pre-configured number he needs. 2. In the menu should be a Bypass Prefix sub-menu in which are stored some prefixes that the application bypasses. (e.g 1, the application does not call the pre-configured number if the dialed one begins with number 1) 3. It should handle the "+" and convert it to "00" We understand that the only way to achieve this for the 3 operating systems is to develop 3 applications. We are going to sell the application to our clients (licence) so we would like to offer to the programmer share of this income. For instance, we can buy license from the programmer and resell it to the customers. Although the budget for this project is small, we are sure that selling further licences to us will benefit both sides, us and the programmer.