any problems with VOIPo and AT&T MicroCell?

[stevech]

right. Verizon has built out about 30 major cities. The cellular industry calls these "the NFL cities". The low hanging fruit.
The LTE modems fall back to 3G (EV-DO) when there's no LTE coverage.

I travel a lot on my job and voice coverage any/everywhere is important. I was forced to use Sprint for two years; happy that's over, as their coverage is comparatively poor.

I have a HTC Incredible Android on Verizon. I must say that using the Internet and doing a simultaneous voice call is something I've not needed; not sure how I'd use it. But it's one of those things that you don't know what you don't know, I suppose. Perhaps it comes up if you tether a PC via cellular. My 'Droid will tether by USB for free (by WiFi costs), but I don't use it much, as I have the USB modem to plug into my PC or into my travel router.