I have approved H1B, but it has been unstamped. I am planning to resign from my employer and move to the US on an H4 visa. Once I am in the US, can I use my H1B with a new employer?
The new employer may be able to apply a cap-exempt H1B petition based on the earlier approved H1B even if there was no stamping. USCIS have approved cases like yours in past.