Do iPhones send automatic replies?

I was taking a nap and my mom called me a couple times and I missed her calls. I woke up and went to text her but my phone says I had already texted her saying, "Can't talk right now… I'll call you later." I remember seeing this in an automatic response tab in the settings, but I didn't even know my phone was ringing so I couldn't have pressed any buttons to send any pre-set messages. Do iPhones send pre-set messages if you don't answer the phone after a few calls? I'm confused.

Those are set to be sent if you choose to do so while getting the call.

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