A B757 CREW; WHILE TAXIING TO GATE AT PHL; ENTERED THE RAMP AREA PRIOR TO CALLING RAMP CTL.

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ON TAXI AFTER LNDG AT PHL; TWR SAID 'EXIT AT HIGH SPD; HOLD SHORT 'N;' CONTACT GND.' GND SAID TO 'TAXI; HOLD SHORT OF K3.' JUST PRIOR TO REACHING K3; GND SAID 'TURN L AT K3; CONTACT RAMP WITH GATE.' WHILE TURNING L AT K3; WE CONTACTED RAMP CTL WHO THOUGHT WE SHOULD NOT HAVE TURNED INTO K3 WITHOUT CONTACTING THEM FIRST. ALSO; A B737 AIRPLANE THAT WAS HOLDING SHORT OF K3 WHEN I EXITED THE RWY AND WAS NOT MOVING WHEN I TURNED IN SAID HE WOULD FILE AN INCIDENT RPT. AT NO TIME WAS THERE ANY POSSIBILITY OF EITHER ACFT HITTING EACH OTHER. I THINK THE REAL PROB IS GND GAVE ME THE IMPRESSION THAT I WAS CLRED IN WHEN THEY SAID 'TURN L AT K3 AND CONTACT RAMP WITH GATE.' THE GEOMETRY OF THE TXWY IS SUCH THAT IT'S IMPOSSIBLE TO TURN AT K3 WITHOUT ENTERING THE RAMP. BETTER TERMINOLOGY WOULD BE TO 'HOLD AT K3; CONTACT RAMP WITH GATE.' SUPPLEMENTAL INFO FROM ACN 541028: THERE IS A HOLD POINT DEPICTED; HOWEVER; IT IS WELL WITHIN THE CONFINES OF THE RAMP. A B737 WHICH WAS ON THE RAMP (TXWY J) JUST L OF TXWY K3 HAD JUST BEEN CLRED TO TAXI AS WE WERE COMING IN. HE STOPPED SHORT OF K3 (HE WAS BARELY MOVING). RAMP CALLED AND SAID THAT WE DIDN'T HAVE CLRNC TO ENTER THE RAMP. THERE WOULD HAVE BEEN A CONFLICT; IT DIDN'T MATTER IF WE STOPPED AT THE HOLDING POINT OR TURNED R ONTO THE RAMP (AS WE DID). THE HOLDING POINT WAS RIGHT IN FRONT OF B737. THERE NEEDS TO BE BETTER COORD BTWN GND AND RAMP AND BETTER GUIDANCE FOR ACFT ENTERING THE RAMP.