Adding Prefix

Hello everyone, I would like a software for Smartphones, that will look at SSID and if? the string character equals? "RRR" lets say then it will (silently if possible) automatically add a prefix in front of the outgoing call. Here is the pseudo code: ------------------------------------------------------------------------ if SSID='RRR' then if? outgoing call number =? (local prefix + NUMBER) ? ? ? ? ? then add xxxx? infront of (local prefix +? NUMBER) else if? outgoing call number =? NUMBER? ? ? ? ? ? then add (xxxx? + local prefix)? infront of (NUMBER) else if outgoing call number = (international prefix + NUMBER) ? ? ? ? ? ? ? ? ? ? then add xxxx infront of? (international prefix + NUMBER) ------------------------------------------------------------------------ This should be really easy but I have no time to do it... Can you do it?? Thank you Marcos