As previously mentioned the Dual-OS Revolution Geeksphone, now is on sale on their website geeksphone.com for €222.
The smartphone features a 4.7-inch IPS display alongside a dual-core 1.6 GHz Intel Atom processor, 4GB memory with internal memory, 1GB of RAM, and a 8MP primary camera alongside a 1.3MP front-facer and a 2,000 mAh battery.
Geeksphone said is easy to switch between Android and Mozilla's browser-centric Firefox OS with a simple 1-touch system.
HSPA/WCDMA: 2100/1900/900/850 MHz
GSM/GPRS/EDGE: 850/900/1800/1900 MHz
HSDPA up to 21Mbps, HSUPA up to 5.76Mbps
GPRS Class 12 / EDGE Class 12
4GB EMMC + 1GB LPDDR2
MicroSD support, Up to 32GB
System I/O: 3.5φ Audio Jack, Micro USB
Sensors: G‐Sensor + E‐Compass + Light/Proximity Sensor
Connectivity: WiFi 802.11 b/g/n, Bluetooth Class 3.0
Screen Size: 4,7" IPS LCD Multi-touch
Main camera: 8 Mpx /Flash LED
Front camera: 1.3 Mpx
Video: 1080p @ 30fps
Battery: 2000 mAh.