How good is the iPhone 5's call quality, and most importantly, how it does it compare across carriers? We addressed some of the iPhone 5's call quality in our CNET review and follow-up stories, but here let's take a listen to the Sprint, Verizon, and AT&T models side-by-side. Is there a difference in audio quality?
For our quick test, I made phone calls from the same street corner in New York City to Brian Bennett upstairs, using all three carrier models both against my ear and held several feet away from me in speakerphone mode. I also made test calls from the same location on all three models to our San Francisco office's voice-quality-testing voice mail drop. For comparison purposes, I also threw in my AT&T iPhone 4S in all instances to see how it fared.
Now, this isn't exactly scientific, because we didn't change locations around the city. We also didn't try other cities.
Here's what we observed. But, before we start, here's a sample of the iPhone 4S on AT&T.