Android application to control who a user can call

We need an android application developed that will only allow an android phone user to call fixed, Pre-programmed numbers loaded onto the android phone. The phone user will not have access to the phones dialing keypad to make calls (unless they have a password to access the keypad). We need a professional application that can be tested by our in-house team. Full functional requirements will be delivered once an NDA is signed. Bidder must be able to show previous work.