This device? It's like calling from laptop pushed to your ear.
Texas Instruments OMAP5432 (1.5 GHz dual-core ARM Cortex-A15, 2x ARM Cortex-M4, 533 MHz PowerVR SGX544MP2, Vivante GC320 2D Accelerator) - Good stable cpu, but it is oooold.
2gb RAM in basic versiom, hmmm, 2gb of ram is good for microwave.
Good device, maybe there is one hope for it. It can be tweaked and work as home stereo central unit controlled from your phone.
As it is linux box some will find a way to use it. After 13 years I still can find something that maybe new samsung galaxy will do it better today, nokia 770 still can.
So, Phone? - No
Mobile Computer? - Depends of software and manufacturer support
Practical Device? - I rather carry laptop, but no need to as I have n900.