It's safer for everyone if you put your phone in airplane mode when you're flying. Cell phone signals can interfere with some of an airplane's crucial systems. 5G technology is less risky and will start to be usable on commercial flights soon.
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Turning the phone off completely will save more battery, as the phone will no longer be searching for a signal or running processes in the background. However, if you want to stay connected while your phone is off, putting it on airplane mode may be the way to go.
When your phone is in Airplane mode, callers will hear the phone ringing, although it's not ringing on your end because your phone is not active. If the caller hangs up without leaving a voice mail, no notification will be generated as it would if your phone were in an active state.
The way this works is that your phone stops all forms of communication with the mobile network when you enter airplane mode. This includes incoming SMS messages, but the network will still queue all messages that are sent to you and deliver them once you turn the phone back on.
Why are airplane passengers asked to put their phones in airplane mode? Per the FAA website's Safety Information page, “The FCC and FAA ban cell phones for airborne use because its signals could interfere with critical aircraft instruments. Devices must be used in airplane mode or with the cellular connection disabled.