B757 CREW ON VISUAL APCH TO PHX RECEIVE TCASII TA 5-6 MI ON FINAL AT 2000 FT.

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FLYING ACR X TUS TO PHX. VECTORED TO FINAL FOR RWY 26R. BROKE OUT VMC BELOW 5000 FT MSL. RPTED FIELD IN SIGHT AT 8-10 MI. WE WERE TOLD TO EXPECT RWY 26L; BUT CLRED FOR VISUAL TO RWY 26R. AT ABOUT 6-7 MI ON FINAL; I SAW AN ACFT ON TCASII AT 11 O'CLOCK AT ABOUT 2 MI FROM US AND INDICATING 800 FT BELOW US. I IMMEDIATELY SHALLOWED OUR DSCNT. WE THEN RECEIVED A TA CALL. I STOPPED OUR DSCNT AND BEGAN A SLIGHT CLB. WE NEVER SAW THE ACFT; BUT TCASII INDICATED IT PASSED DIRECTLY UNDER US; 800 FT BELOW US. AT THAT TIME WE WERE APPROX 500 FT ABOVE GS. I TOLD THE CAPT TO RPT IT TO APCH BECAUSE THE ACFT WAS HEADED TOWARD THE NEXT AIRLINER BEHIND US. APCH MERELY RESPONDED WITH 'ROGER' AND NO WARNING TO THE NEXT ACFT. ON THE GND; I CALLED THE APCH SUPVR. HE WAS TOTALLY UNCONCERNED AND STATED THAT THIS HAPPENED ALL THE TIME; EVERYDAY. WHEN I STATED THAT WE WOULD HAVE PASSED DANGEROUSLY CLOSE IF I HAD NOT CLBED; HE STATED; 'I DOUBT THAT.' I FOUND THIS NON-ATTITUDE TOWARD THIS INCREDIBLY DANGEROUS SIT ABSOLUTELY UNBELIEVABLE. SOMEONE NEEDS TO CHANGE THE BOUNDARIES OF THE CLASS B AIRSPACE AROUND PHX AND FORCE THESE APCH CTLRS TO ISSUE US TFC WARNINGS OR THERE WILL BE A FATAL ACCIDENT HERE. WE DO GET BELOW GS ON OCCASION; AND WHO IS TO SAY THESE SMALL PLANE PLTS NEVER GO A FEW HUNDRED FT HIGHER THAN INTENDED?