When can apply SSN H1-B got approved

Hi ,

My H1-B got approved and have I-797 document.When can i apply for SSN.

My H4 will expires in 27Sep2103 and H1-B from 01Oct2013.Can i apply for H4 extesion for 3 days.Is it create any problem in future.

Thanks in advance

I don’t think it will be an issue to not have H-4 extension for those 3 days. Still you should confirm w/ H-1 attorney.

You can apply for SSN after Oct 1 when their systems will start reflecting your status as H-1.

Thanks a lot Saurabh