Ah.. okay, I just read somewhere that Google Voice was USA + Canada, but apparently not for app-install purposes. The OnePlusOne doesn't get it (without tricks) either.

Found another free service while hunting: Text+

Free 2-way SMS over wifi, to/from regular mobiles as well as other Text+ users. It also has voice calling, both inbound/outbound. 2.2 cents/minute USA+Canada, or free to/from other Text+ users.

The service assigns a (free) local telephone number to enable it to interact (text/phone) with other (regular) mobiles.

We just want it for texting, and so far, so good.