A:AnswerYou need to buy a model that is LTE Capable, buying one without a Sim Card adapter will only be usable via Wifi....though you could bluetooth connect it to your phone.
A:AnswerThere is Blue screen setting available just go to the top of the screen pull down on the screen till you see the example below. Then where the short two horizontal lines are pull them down and locate the Blue Light icon press it so it turns bolder color then Close the window and it is set.
A:AnswerI bought mine open box and it works great. It had been factory reset already. Supposed to have full warranty too. Just make sure nothing is missing. Good deal on mine