From Forum Nokia Wiki

About: "However for development you do not have to require an UID to Symbian: each UID3 in the range 0x01000000 to 0x0fffffff is available for development. Just do not redistribuite any application using these UIDs."

There you get a info about 0x01000000 - 0x0fffffff range? I look at Symbian Signed UID Faq and find out only about Class 0 UIDs: 0x00000000 - 0x0fffffff. Maybe that range should start from 0x00000000? How you feel?