The frequent contact number is mainly for workers in production lines to make a phone call to their superiors/outside contacts during out of McKey's office working time and phone is locked for calling out. When worker can't find his superior and can't contact inventory office to looking for them. They need to call them at mobile phone.
And each superior takes responsible in different roles (FG, PK, G4, LR-P1, LR-P2, MR-P1, MR-P2 and Beef Line), some job can't make decision for each other. That's why we need some more numbers to support.