Cell Phone Application

I need to develop an application for cell phone, which I do not even know if it is possible.

What i need is an application that would intercept any number dialed and dial something else.

Everytime a number is dialed and the SEND key is pressed, this number must be altered to another one.

I will explain by example.

1) The user dials 555 9999 and press Send Key

2) The application intercepts this number and change it to? 9999 9999 +? (a configured? number) + * 555 9999 (which is the number the user originally dialed)

The last set of numbers should be send as DTMF.

Is this possible to be done at all?

If so, please, place your bid.

Thanks for looking.

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