回複：關於使用工卡，請知道的大俠指點一下

what I know is you can apply SSN when you have EAD card received. You can get the SSN number at the same day when you apply it in the local office. You can show this SSN number to your HR and don't need to wait the SSN card received.

By the way, can you let me know how long you get your EAD? which center? Thanks!