回複：phone call, %50 accuracy. those custom service people

are not professional enough, so often give incorrect information; infopass (local office) about 70% accuracy, the computer systems might not update frequently or the IOs don't have enough computer skills to check it or wrong operation etc. Letter to first lady will get the most accuracy result, 99.99%, the letter will be transfered to the Department of Justice, and then FBI, FBI will write a letter to you when your NC has been sent to them and when the result has been sent back to USCIS or still pending. good luck!