Here in Finland 27 worked for me, the device is 99€ Evix T1 from HalpaHalli. When I bought this device it was horribly slow but now with Uberoid it sure rocks. Only problem now seems to be poor WiFi connectivity and I am now looking for a proper solution for that.
Another thing some people reported is the malfunctioning touch screen while the device is being charged. I can verify that and my solution was to switch using other decent charger. Seems like the device is picking up a lot of noise from original charger.