I just interviewed last week and am 121 and had to do the sim. Actually, both of us that were 121 had to do the sim, and one CFI didn't have to. We were surprised, and the HR lady explained that she was new and that they aren't determining who does the SIM based on 121 or not any longer. I was glad I had spent an hour studying for the SIM just in case, so don't count on not doing it.