這是網站提示：
Your case can not be found at this time in My Case Status. Please check your receipt number and try again. If you need further assistance, please call the National Customer Service Center at 1.800.375.5283.
是怎莫回事？
-Perhaps USCIS forget to put your case information into the online status checking system.
我應該打電話嗎？
-You can.
