I kept mine longer than most folks I know. Never used it to call out, but occasionally some one would call me that I knew but didn't have my cell number, I could always be found in "the book" if they needed me. Plus, I felt it a back up in case of emergency, thinking while one system would be down, the other might work.
Then, about the time I realized that the only calls I got on it was from those $*%$$%^%ing telemarketers, the phone company in all its wisdom raised the rates. Goodbye!