Change of status
1. The employer can revoke, but, USCIS says, after 180 days they will not revoke the H-4 EAD.
2. You will not need to change the H-4 EAD upon moving to any number of companies, as long as you maintain your H-1 status.
According, to USCIS, when you are working under AC21 you are not out of status, you are in fact working according to the law and hence you should be able to join back. More...
Discussion Topics, Thursday, 6 October 2016:
FAQ: Issues regarding changing jobs while on H-1:-- Is there a minimum time gap necessary to transfer H-1 from one job to another, change jobs| timing of resigning and joining; Errors in visa and passport; Name spellings different in various documents; Arrival departure records from-to Canada; Liquidated damages clause in H-1 employment contract; Applying for EB-1 if EB-2 is in process; Changing careers on H-1
Other: Indian passport for child born in USA; Priority dates movement; Work visa or status for students; Correcting errors in I-140 approval; Changing from B (visitors visa, tourist visa, business visa) to student status; Minimum days needed on passport expiration for visa entry; Processing through NVC; H-1B extension beyond 6 years; Visa dates movement, changing jobs on H-1, priority date transfer, approval of I-140; Adoption and immigration; Name discrepancy when applying for parents visa; Changing jobs, filing I-485, precautions for priority date transfer, etc
Discussion Topics, Thursday, 14 January 2016:
FAQ: Percentage arrangement for salary; Naturalization (citizenship) after lengthy stay abroad; H-1 6 years expiring, options; H-1 Cap exemption, visa stamped, but never worked; FAQ: Can I apply for H-4 visa if H-1 visa is rejected; can I convert from H-4 to H-1; Filing multiple PERM/green card petitions; Green card EB-1C international executive or manager, L-1A.
Other: Entering USA close to visa expiration; L-1B to L-1A and PERM; Transfer of priority date, green card through future employment, H-4 EAD based upon old employer’s I-140; H-4 EAD applying for green card, extending H-1; H-4 to H-1 conversion; Green card through future employer; Green card job duties, job title, promotion; G-315a RFE; Affidavit of birth; H-4 EAD and Change of Status; Priority date transfer, etc.