Lancer, I have yet to have any trouble with late or changed sims or sign ons. Once you have done your 15-4 you do not have to have contact with the company before your sign on. Likewise with sims after you are cleared from your last A day or finish of your trip it is up to the company to try and find you. You do not have to keep in touch with them. Hence I usually have a last look the afternoon before a sim. After that I just appear in Qcc an hour before the start time and check in with schedulers. At least then I get paid for turning up to a cancelled sim.