We have AT&T family plan and we have great coverage here.

I get upset with my sister at times when she turns her phone off, mainly because if hers is off and something happens with her children, like they are sick and want to go home, or need something for a headache or minor things, then it's me they call and I am expected to take care of it.
My sister only has a cell phone so I have no way to call her, hence I end up being the one that has to take care of things. All the while she is home taking a nap!!!

I don't get upset about people not answering (except my sister) so much, but I get more upset about the fact that when I don't answer folks seem to get irritated with me. Now mind you, it's seldom I don't answer my phone. I have a child in school, and lots of things going on, so even when I am not sure of a number I answer my phone. On the rare occasion I'm taking a shower or doing something else in the bathroom, or I'm outside hanging clothes or mowing, and my phone rings where I cannot get to it, I do not expect to get the third degree because I didn't answer my phone one time out of 20 calls. That upsets me more than anything, and my husband tends to be the worst. LOL
He will call my cell, then call the house and then leave a irritated msg about how I didn't answer my phone and now I'm not answering the house phone either. Now that my friends, is annoying. I just shake my head and go on. What else can you do. LOL