Verizon iPhone 5: repeatedly being told I sound "distant" or "under water"

Months ago, I switched from AT&T to Verizon for a variety of reasons. Was great for awhile -- then I was made aware of an issue where portions of my multi-part texts to AT&T recipients would disappear into the ether.

And then, as recently as tonight, I was told yet again that I sound far away. This has been an on/off problem across two different iPhone 5s of mine, both on Verizon, over the past few months. For some people -- always on a GSM network, best I can tell -- I sound "distant" or "under water."

This never, ever happened on AT&T with the same people, as tested with my former AT&T iPhone 5 during a brief switch back.

Hard resets don't help. Neither does an iTunes restore -> "set up as a new phone." Seriously considering a return to AT&T, even as much as I dislike some of their practices in the past.

Anyone have any suggestions on things I could try to help fix this?

Source: http://forums.macrumors.com/showthread.php?t=1580359&goto=newpost

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