I recently took a new job that requires me to spend a lot of time in the lower level of a hotel where I don't get any reception. I've noticed that when in roaming, my battery will get sucked dry in a matter of a hours. I disabled the ability for my phone to go into roaming, but I've noticed that when I go underground, my phone will turn itself on when it loses the signal,and still gets drained as when in roaming. I set the phone to turn itself off after 1 minute, but it's still going dry midway through my day, whereas before, I could go all day without it ever going below 50%.
Is there a way or program to keep my phone from turning itself on period? I thought there was a program that was supposed to do that but I can't find it. Thanks.

if you want the phone to not turn on. use flight mode...

I'll try that today. I thought I did before and it still turned on, but I'll give it a go and let you know how it went.