[…] HELP WANTED—Reading to Blind Man, and a telephone number. (1.2)
The initial communication between Robert and the woman comes from a newspaper. There is nothing extraordinarily significant about this. We provide the quote to highlight the variety of mediums the story uses to explore the theme of communication.
The blind man made a tape. He sent her the tape. She made a tape. This went on for years. (1.4)
This is basically the woman and Robert's version of writing letters. It's a simple example of a solution to a communication problem. It suggests that the best solutions are often simple and straightforward.
Next to writing a poem every year, I think it was her chief means of recreation. (1.5)
In this sentence, the narrator communicates to the reader that he considers both his wife's poetry writing, and her correspondence with Robert as "recreation." Though we don't get her view, we can assume that these modes of communication are vital to her well being, rather than optional recreational activities.