A woman is talking to a friend on her cell phone and says "a woman just killed herself in front of me ( by jumping in front of a subway train) and she looked just like me". So the girl takes the dead woman's bag and decides to go to her apartment and ends up taking on this woman's identity. Seems no one noticed that she is not the dead woman. Other clips from the tailer show she had 75 k in a bank account, a woman in the back of a car saying "you're not so and so", the girl burying a body at night, by a car, the girl having sex with the dead woman's boyfriend and the girl asking herself asking how many of me are there.

I think I saw the trailer on either the Skyfall dvd or the Thorne-Sleepyhead/Scaredy Cat dvd So it may be a British film. The title maybe something like "Opi Ian Black"?

What is the title?

Orphan Black (2013 TV series)
Starring Tatiana Maslany, Dylan Bruce, Jordan Gavaris
IMDb synopsis:
Orphan Black follows outsider, orphan and street-wise chameleon Sarah. After witnessing a woman's suicide, Sarah assumes the strangers identity - who happens to look just like her. Expecting to solve all her problems by cleaning out the dead woman's savings, Sarah is instead thrust headlong into a kaleidoscopic mystery as she realizes the dizzying truth - she and the dead woman are clones. As Sarah searches for answers, she discovers the chilling fact that there are more people like her out there - genetically identical individuals who were planted in unsuspecting birth parents and nurtured in completely different circumstances. With no idea who created the clones, she'll need to discover the reason in a hurry as an assassin is killing them one by one.

Orphan Black (TV Series 2013 (http://www.imdb.com/title/tt2234222/?ref_=fn_al_tt_1)