At last, PHL willl catch up to the dozens of other major airports around the country tomorrow. The airport will open its new 150-space cell phone waiting lot with a ribbon cutting at 1 p.m. Let's hope drivers can find this one with good signage. The directions, according to an annoucement from the airport just now: Take the "arrivals" road and go past the rental car lots, Follow the signs that say: "Return to Terminal," which will lead to the lot.