CONELRAD

[abefroman329]

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Airplane Mode, not connected to a WiFi, probably would have sufficed. I'm not 100% sure you can completely shut off an iPhone.

Drain the battery

Yes you can.

That is the only scenario in which I'm 100% sure my iPhone was completely shut off.

[US 89]

...
Airplane Mode, not connected to a WiFi, probably would have sufficed. I'm not 100% sure you can completely shut off an iPhone.

Drain the battery

Yes you can.

That is the only scenario in which I'm 100% sure my iPhone was completely shut off.

What about holding the power button and then "swipe to power off"?

[abefroman329]

...
Airplane Mode, not connected to a WiFi, probably would have sufficed. I'm not 100% sure you can completely shut off an iPhone.

Drain the battery

Yes you can.

That is the only scenario in which I'm 100% sure my iPhone was completely shut off.

What about holding the power button and then "swipe to power off"?

In a very intangible sense, it just doesn't feel like the phone is actually turned off when I do that. It's not like it was with dumbphones, where there was an on/off switch, or a blank screen meant it was turned off (as opposed to simply being locked).

[renegade]

I wonder if it was my carrier. I am cheap and use Consumer Cellular.

I brought my own unlocked Nokia dumbphone to Consumer Cellular a few years ago.  My phone sounded-off at the time they said it would.  I do not have a message plan. so the only thing that showed up on the screen was 'OK' and an 'X', with no other message.