I got a new phone! It's a Microsoft/Nokia Lumia 640.*
* Full disclosure: I work for Microsoft now, but not in any business related to PR/Marketing/Phones. This is not a promotion, and I bought this phone to replace the one I left in a Taxi due to my own ineptitude.
I ran into a snag when I was trying to configure it for my Google Voice Voicemail. Normally all I have to do is dial a special code (**44*my Google voice number*11#) and that configures no answer/busy/offline call forwarding, but it didn't work this time.
On this phone you configure call forwarding differently.
Open Settings >> Network+ >> Call Settings >> Set
Here I was able to configure individual options for no-answer call forwarding and all is right with the world again. Magic!
The phone is pretty good so far. The battery life under actual use conditions is head-and-shoulders above the HTC. I miss the physical camera button, but will eventually adapt.