It's taken many years, but it seems that around 2013/2014, good quality dreamcast emulation has become a possibility on android OS devices through reicast (emulator). There are several chinese manufactured handhelds that are starting to have good enough specs to run games smoothly, and in fact, I think several android based phones such as the samsung galaxy series can now do decent emulation (although I imagine controls suck on the phone). Sometimes the handhelds have features like HDMI output.

Does anyone already use one of these systems for dreamcast emulation?

Example: JXD s7800b


DC emulation on JXD s7800b
reicast Emulador de DREAMCAST para Android - Consola Android JXD S7800b - Sonic Adventure - YouTube