H-1B or H4 visa status from 1st October for approved H-1B case

Hi Saurabh, 


I'd applied for my 2013 H-1B visa in May which was approved last week. I'm currently on H4. Will my status automatically change to H-1B, from 1st October 2012, even if I'm not on any project / payroll  of my consultant / client ? If not, when will it change ?