Listen Voice appears to be sort of an audio blog that can be recorded by phone.
It’s free if you limit each call to five minutes or less. However, the number is in Boston, so the calls are long-distance. They do have an option, though, of you leaving your number and then they will call you. I haven’t tried it yet, so don’t know how well that works.
Even with those issues, I’m still adding it to The Best Sites For Students To Record Audio By Phone, just because that list is so small because of companies going out of business.