Ok. For a phone call, it is an extra fee, or we can continue here without additional charge. Unfortunately, there is no longer any grace period. Even when there was, it was for 30 days and it was unofficial. So you re correct, on March 1, 2016 you become out of status. Once that happens, your visa is automatically invalidated. If you leave the U.S. on the 29th, your visa should remain good and you can use it once your new employer files for you and gets an approval. Do Premium Processing so you can get a decision within 15 business days. You would use the visa and the approval notice to come back into the U.S. If you leave after the 29th, your visa is invalidated, but because you have an H-1B visa stamp already, you could go for new H-1B visa stamping to Mexico or Canada. If you decide to stay out of status, keep in mind that you should leave the U.S. as quickly as possible. The faster you leave, the easier it will be to convince a visa officer that your overstay was brief, reasonable, and won't happen again.
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