QUOTE(BexandAlan @ Apr 15 2008, 06:51 AM)

I think there are problems applying after your married because you no longer have a 'valid' visa as the K1 expires when you get married or in 90 days which ever comes first. I believe thats why people recommend you apply before the wedding. You'll need a SSN to do things like open a bank account (in most cases) so its better to have one than not.After your married you just apply for a name change not a new SSN. If you leave it then you have to wait for AP and EAD i think, this is all based on what I have read on VJ, if you search through old threads its been talked about plenty of times.
Best Wishes
Bex xxx
Your K-1 visa expires 6 months after issuance or upon your arrival to the USA. Once admitted to the USA, you are granted K-1 STATUS for 90 days as indicated by the I-94. On K-1 status, you have 76 days after arrival to apply for a SSN. After the 76th day, you are precluded from applying and will have to wait until you are again eligible which occurs after approval of EAD (I-765) or green card (I-485), whichever occurs first.