I am on H1B and would like to transfer on H4 visa (as a dependent on my spouse who is also on H1B). We filed for the transfer recently and might receive the receipt letter in a week or so. My question is: Once we receive the receipt notice, will I be technically on H4 and can stay in the country, or do we have to receive the actual "approval" from USCIS for the status change. I would like to resign from my H1B after confirming that my H4 status is valid. Please advice.