取得绿卡和入籍后要更新SS Card，SSA的规定参见http://www.ssa.gov/pubs/10002.html中的以下两段话。
不换卡会有什么问题或不便，我也不知道，反正既然这么规定，换了放心点。
换卡不花钱，要花时间排队。ssa.gov网站上输入ZIP code后就会告诉你就近的SSA办公室，但只列出最近的一个，不一定是人少的一个，问问同事去过哪个人少，可以省时间。（慢的要可能等一个多小时）。
What if my immigration status or citizenship changed?
=====================================================
If your immigration status changed or you became a U.S. citizen, you should tell Social Security so your records can be updated. To get your immigration status or citizenship corrected, you need to show documents that prove your new status or citizenship. Only certain documents can be accepted as proof of citizenship for new and replacement cards. These include your U.S. passport, a Certificate of Naturalization or a Certificate of Citizenship. If you are not a U.S. citizen, Social Security will ask to see your current immigration documents.
Are there different types of cards?
====================================
We issue three types of Social Security cards. All cards show your name and Social Security number.
The first type of card shows your name and Social Security number and lets you work without restriction. We issue it to:
U.S. citizens; and
People lawfully admitted to the United States on a permanent basis.
The second type of card shows your name and number and notes, “VALID FOR WORK ONLY WITH DHS AUTHORIZATION.” We issue this type of card to people lawfully admitted to the United States on a temporary basis who have DHS authorization to work.
The third type of card shows your name and number and notes, “NOT VALID FOR EMPLOYMENT.” We issue it to people from other countries:
Who are lawfully admitted to the United States without work authorization from DHS, but with a valid nonwork reason for needing a Social Security number; or
Who need a number because of a federal law requiring a Social Security number to get a benefit or service.
不换卡会有什么问题或不便，我也不知道，反正既然这么规定，换了放心点。
换卡不花钱，要花时间排队。ssa.gov网站上输入ZIP code后就会告诉你就近的SSA办公室，但只列出最近的一个，不一定是人少的一个，问问同事去过哪个人少，可以省时间。（慢的要可能等一个多小时）。
What if my immigration status or citizenship changed?
=====================================================
If your immigration status changed or you became a U.S. citizen, you should tell Social Security so your records can be updated. To get your immigration status or citizenship corrected, you need to show documents that prove your new status or citizenship. Only certain documents can be accepted as proof of citizenship for new and replacement cards. These include your U.S. passport, a Certificate of Naturalization or a Certificate of Citizenship. If you are not a U.S. citizen, Social Security will ask to see your current immigration documents.
Are there different types of cards?
====================================
We issue three types of Social Security cards. All cards show your name and Social Security number.
The first type of card shows your name and Social Security number and lets you work without restriction. We issue it to:
U.S. citizens; and
People lawfully admitted to the United States on a permanent basis.
The second type of card shows your name and number and notes, “VALID FOR WORK ONLY WITH DHS AUTHORIZATION.” We issue this type of card to people lawfully admitted to the United States on a temporary basis who have DHS authorization to work.
The third type of card shows your name and number and notes, “NOT VALID FOR EMPLOYMENT.” We issue it to people from other countries:
Who are lawfully admitted to the United States without work authorization from DHS, but with a valid nonwork reason for needing a Social Security number; or
Who need a number because of a federal law requiring a Social Security number to get a benefit or service.
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