Does it look bad to not answer the phone?

I’ve been working at a jail for about 3 weeks. I am just working 3 days a week right now I worked Sunday through Tuesday. I have a feeling they are going to try and call me in tomorrow and I don’t want to go in. I need to get my yard work and other errands done. If they call should I just not answer and then call back in a few hours and apologize and say I slept through the call? What is a good idea? Does this look bad? I am not paid to be on call. They tried to call me in once before but I was legitimately 2 hours away and I told them that so they may think I’m unreliable already. I have shows up all my scheduled days though. Advice?

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