Can someone with both B1 and F1 visas stamped, enter the US on B1 visa now (since F1 entry can be only 30 days prior to start of classes), later depart and re-enter on F1 to start university in fall ?
Shouldn’t be a problem as long as you enter for legitimate business or tourism/vacation purpose and state that clearly and convincingly to the CBP at the PoE.
So one can simultaneously hold 2 valid visas, and obtaining of one does not invalidate the other - as I understand.
Yes, you are allowed to have more than one visa, but you can only hold one status while in the US.
Is clear now. Thanks.