 F-1 visas are only issued in U.S. embassies and consulates outside the United States, although extensions of stay and changes of status may be possible within the United States.Prospective F-1 students must apply at the schools and receive a form I-20 in order to apply for an F-1 visa.F-1 students must show that they are able to support themselves during their stay in the U.S., as their opportunities for legal employment are quite limited.