you met a man and he ..
asked for your phone number >> that's a sign he's interested in you..(but if he asked for ur fren's phone number too..might be he's a player)
didnt asked for your number >> he didnt interested in you..he's not available anymore..or he didnt have a mobile phone(which is impossible)
give you his number >> he is a dominant kind of guy or he's being stingy..or he's trying he's luck..
ever wonder..how complicated a guy can be?