Most people call me to get some information or to push some information to me. Unless they need the answer now I want a text message of some sort, not a call. I'm okay with people like my parents calling at a predetermined moment to catch up. But most people who want to call me want to do so at a moment when a text message would be hugely preferable, so I don't answer unless I get a reason (via text) why the call should happen now. In many cases this leads to the conversation going much more efficiently via text and allows me to actually defer it to when I have time or energy for it.