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父母移民，入境美国多久可收到绿卡和社安号码？如何去交$168绿卡手续费（入关时没人收）？

-Do you mean the immigrant fee? It is $220, not $168. You need to pay this fee online, then USCIS will send the green card to your parents. See this link for the payment:

https://www.uscis.gov/forms/uscis-immigrant-fee

 

社安号码要去申请才会有吗？-Did your parents request SSN card in the DS 260 when they applied for the immigrant visa? If no, they need to appy for it in the loca SSA Office.

要等绿卡到手才能申请吗？-Not need. Just bring the passport which has the endorsed immigrant visa to apply for it in the local SSA Office.

谢谢解答。