I just had one that made my 2.5 hour sit a 3.5 hour sit for my new flight. I didn’t answer my phone when CS called. I showed up for my scheduled flight and scanned my ID. Instead of getting the green light, I got a red one forcing me to check my schedule. The reroute replaced two short legs with one long leg to a 10-hour layover. It also made my legal duty day longer since I only had two instead of three legs. So, long story to say just because you don’t answer your phone or check your schedule doesn’t mean you can’t still be rerouted.