[sicelo]

Nokia N900 Motorola Droid 4

For these two, see https://maemo-leste.github.io/

You can text and use gps on both of them, as well as make voice calls on the Motorola Droid 4 (calls work on N900, but you need complex audio routing and audio filtering. If anyone has experience with Linux audio, the project will appreciate their assistance)

Yes, they both have non-free PowerVR GPU, but its blobs work on Linux mainline, at least

[GhettoComputers]

Too bad about the CDMA network stuff and 3G, it doesn’t seem like it’ll be usable anymore. If VOIP works I think the calling issue can be mitigated.

[sicelo]

3G is still working where I live, and will be, for quite some time :-) And yes, VoIP works (if you install a VoIP application), so that's a non-issue.