H1B validity

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I had a H1B visa valid from Mar 2011 to Feb 2013 which I didn’t utilize.I came to USA in H4 visa.Can I use my H1B now to work?

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An employer needs to file cap-exempt petition along w/ COS for you. Once approved, you can work as your status would become H-1. Until then, you cannot work on H-1.

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