I had applied for an H4 extention in June 2004 and for a new H1B in Sep 2004. I went to India and got my H4 visa stamped on Jan 4th 2005. I came back to the US on H4 visa on February 1st, 2005. Upon my arrival in the US I came to know that I got my H1B approved on Jan 12th, 2005. Is there any problem for me to apply for SSN and working on my new H1B Visa? Thanks for your help in advance.