Posted by: Gohtalo March 23, 2011
F 1 to H 4 question ??
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i539 for adjustment of status u can eFile($290)  it how long no one is in position to answer that based on cases
i think H1-4 are immigrant intent visa so better to convert in that and apply for GC 
i485 is the form that you file in your GC to adjust the status form F1 to GC H4 to GC no matter what your status it
i485 is called Adjust of Permanent Resident Status so they will adjust from whatever to GC after you are in that state
SSN will be same for ever whether u  r in F1 H1-4 GC or Citizen legal or illegal
Hope that helps
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