How to get HeLa cells from adherent culture into suspension culture?

Hi, I would like to grow HeLa cells in suspension since you can grow up more culture then as adherent cells. Therefore, I am wondering what I need to do with my HeLa cells which are growing adherent on plates at the moment? Do I need to use RPMI or DMEM media or some special media to get them by stirring into suspension culture? I really appreciate any advice from people who have done this already. Thanks in advance, Nicole