I saw the TVB channel at this local chinese restaurant i was at, and it showed one of the really old dramas, it was called a step back into the past or something. and then this reminded me about an old thing i've seen but i dont remember the name, chinese or english. it was the one about the guy with the cellphone that could call back to another similar/same cellphone into the past and stuff. i remember the part where the guy was gonna the "past" guy's friend with lottery but somethign wet wrong. i think it was a mystery drama.
Oh, I think I know what series you're talking about.. it's with Roger Kwok and some other people.. I think it's that title above ^, :O.