I tried each of the three settings and made recordings through my Visual Voicemail of the three different qualities. I'm probably going to stick with 13k, but I couldn't tell the difference between EVRC-B and 13k. I could, however, tell that EVRC is far inferior to the other two. I guess it just comes down to personal preference. If anyone can analyze these clips further, for a definitive answer, please be my guest. Hopefully it helps everyone make a decision on whether this is worthwhile.
PS - ignore the part with the music at the end of each clip. It really was pointless, and comes out as just bad noise. The 13k is lower because the phone was held back from the speakers. They all failed at receiving the loud music.
Since a "Security Token" was missing and I was unable to upload the files to this post, you can find them at the following link:
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