I was a witness to an accident. As I was crossing the street a cyclist was not too far behind. Anyway, he was halfway when the light changed and a gypsy cab struck him. He instructed the gypsy cab to pull over several times but the cabbie drove off. He asked to borrow my phone to call 911. After he returned my phone I told him the license plate of the cabbie and I left. I did not give the cyclist my information. In order to be on the record as a witness how would I go about contacting 911? Would they keep a record of the call and the telephone that called them?