T-Mobile Android devices have had Wifi calling for some time so I’m not posting my whole review of the new $25 CellSpot here (tl;dr: Get it, no brainer). But I did use a LG Flex to test out the handoffs and it it did work well. So there’s that.
More importantly, I was grilling T-Mobile on if the Nexus 4 (which I have) or Nexus 5 (which they sell) would be supported for Wifi calling. The bad news is that neither phone is currently supported. That goes against their “Wifi calling works on every smartphone they sell” policy but the Nexus is a special case with software controlled by Google so there is at least an excuse.
The good news?
When asked about that part, a T-Mobile rep told me that they were hard at work on Google’s next Nexus device, the Nexus 6, working for later this year.
Google hasn’t officially announced a Nexus 6 but the company is rumored to be collaborating with Motorola on a handset and it traditionally releases this product right before the holiday shopping period.