I am getting a iPad mini tomorrow. My only decision now is whether or not to get the LTE model or just WiFi. I am have AT&T shared data plan, so if I got the cellular model, it would be +$10/month. But I also have an iPhone 5 with the ability to use the mobile hotspot. I could save some money if I just used that for my iPad. But I wouldn't want to go through and turn it on/off everytime I used my iPad. For that reason I would just like to leave it on all the time. When I do, it will obviously have a password so I'm not worried about it using up my data. But I would be worried about my phone's battery life. I'm guessing, however, that it doesn't use up battery life because you can set it to go through the phone's airport antenna (instead of Bluetooth) which I have turned on all the time anyway. Am I right?