Friends this is the only device which supports both so if you are worried that your tata sim does not work on any of other devices
So feel stress free this device supports your tata sim
As the style is the worst so thick like a brick in hand so small touch screen very bad touch
As this device is the only which supports tata sim it also costs avout 9000 rupees the price is extremely high I have this device as I had a tata sim and it dint sypport any of my device
And note that thus device is not an android device it is a java supported device but you can use whatsapp on this device this device have just around 60 mb storage not sufficient