I did some fact checking--
looks like my ancient Mytouch Slide smartphone meets thier requirements. (arm7 with NEON and VFPv3 (32bits))
I already have a debian system sandboxed, and have root access. (for proper mobile encrypted email and the like)
this is one of those older phones with a hardware slideout keyboard. The resolution is kinda crippled at 800x480, but running in console mode over the terminal emulator should be no problem with this.
It's about as powerful as the open pandora linked by the OP. I just dont want to pay the 30$ that eltech wants for exagear-desktop.
(the mytouch slide is actually a little heavier, cpu wise. it has a dual core snapdragon, clocked at 1.2ghz. it's the 512mb main memory that's the bitch. DF will chew swap like bubble gum. Maybe a good test of using zram swap?)
on the plus side, this would allow me to run quite a few more things in my debian sandbox though.
Since this phone is rather ancient, quite a few people here should have smartphones powerful enough and with the appropriate cpu capabilities.
on android devices, you can find out easily. just install an app called "terminal emulator" from the play store (does not require root) then run:
cat /proc/cpuinfo
that should tell you about the cpu in your android phone. Getting a chroot sandbox up and running is your own problem, though if you have root access, you can try another app called "linux deploy". You access the sandboxed linux over ssh or vnc, so you will need an ssh client like connectbot to access the local sandbox over the localhost, or you can waste the resources starting and using vnc for a full graphical environment.
I will save up a few pennies and take the plunge some time. It would be funny to finally have DF running on a smartphone.