Believe it or not, there are still landlines in our midst. Do you have one, or know someone who has, because of a poor cell signal at home, to name one reason? In that case, mentioning the issue to the carrier can in some situations produce a free signal booster. If need be, perhaps incurring the one-time cost of the booster would make more sense than the monthly landline charge. Basic units start on Amazon for just under $200. And that's just one example.
Below is a list of substitutes for those persistent reasons for a landline (phone/fax/DSL).