用confirmation number 就能約成，到了再說。

而且 E-file裏有一條：
You must contact the USCIS National Custer Service Center, if instructed to do so on your Confirmation Receipt Notice, at 1-800-375-5283 to Schedule an appointment with your local Application Support Center using your Confirmation Receipt notice or your offical receipt notice (I-797). The Application Support Center will collect a digital photograph, signature, and fingerprint from you at your appointment.
我覺得不能等待，等到他們寄給你指紋通知，太晚了。先約一下，如果不能弄，再回來等唄。

所有跟帖： 

• But the confirmationreceipt stated, 回複：用confirmation number 就能約 -focus09- ♂ (392 bytes) () 06/15/2010 postreply 19:00:31

• focus09兄，你是正確的。我cancell了預約。還是等待吧。我會告訴你我的信息。 -gccanada- ♂ (0 bytes) () 06/16/2010 postreply 04:52:52