<human>: Here is a goal: How can you conserve your phone battery and make a low battery last longer?

Which way makes more sense to accomplish this goal?

OPTIONS:
- Put the phone in rice, this will conserve power, turning it off and on wastes more battery than setting it in rice.
- Put the phone in airplane mode, this will conserve power, turning it off and on wastes more battery than setting it in airplane mode.
<bot>: Put the phone in airplane mode, this will conserve power, turning it off and on wastes more battery than setting it in airplane mode.