An H4 visa may be obtained by an H1B, H1C, H2A, H2B or H3 visa holder’s spouse and minor children. An H4 visa holder may remain in the US as long as the H visa holder remains in legal status. An H4 visa holder may change his or her status in the US.
In general, an H4 visa holder may not accept employment. He or she must obtain a work visa. On May 26, 2015 USCIS will allow H4 visa holders who are spouses of H1B visa holders that have an approved I-140 and have been granted H1B visa status under AC21 regulations to apply for an EAD.
H4 visa holders may engage in full or part time study.