Nvidia Shield - description and parameters
Nvidia Shield doesn't have a GSM transmitter, it cannot be used as a phone. Official announcement date is July 2014. The device is working on an Android OS, v4.4.2 (KitKat), planned upgrade to v5.0.1 (Lollipop) with a Quad-core 2.2 GHz Cortex-A15 processor and 2 GB RAM memory. Nvidia Shield has 16 GB of internal memory. This device has a Nvidia Tegra K1 chipset. The main screen size is 8.0 inches with 1920 x 1200 pixels resolution. It has a 283 ppi pixel density. The screen covers about 66.6% of the device's body. The result is quite good.
This is not a GSM device, it will not work on any GSM network worldwide.