Telephone Etiquette

This is something bad that I do. I don't answer the phone. It rings, and if I'm doing something else, or if I just don't feel feel like answering, I ignore it. People seem really upset by this. "I rang you about seven last night, but you weren't in." "Yes I was. I was busy eating my tea." "But what if it was important?" (Leave a message. Write me a letter). Why does everyone assume that the telephone gives them the right to butt into my life whenever they feel like it? My mobile's turned off most of the time as well. It's nothing important, but people do seem to regard it as a bit aberrant.
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