That hasn't been true for over a decade.It's actually not that hard at all. Look on the side of your phone or tablet for a special button labeled "Power".
If you can't turn that button off the problem isn't with the service providers.
By September 2004, a new NSA technique enabled the agency to find cellphones even when they were turned off. JSOC troops called this “The Find,” and it gave them thousands of new targets, including members of a burgeoning al-Qaeda-sponsored insurgency in Iraq, according to members of the unit.
But my point wasn't technological, rather philosophical. It seems people are happily trying to avoid ever really disengaging from their daily lives that revolve around being constantly plugged in and connected. I struggle with it, I have a SPOT tracker for solo trips that use quite often.