Hello, I'm wondering if I should have purchased a cellular iPad Mini instead of a wifi one. I have an iPhone, though I'm not willing to part ways with my unlimited data plan. I was also initially going to just use my iPhone when I can't take my iPad along with me. Are there any other "pluses" to having the cellular version? Can it do anything that the wifi only model cannot? Is it like an iPhone wherein you are hooked up to LTE all of the time unless you have wifi on? I would get the T Mobile version and just keep the free data on along with wifi if possible. Thanks!