Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to make your cell phone battery last longer [title] Turn the phone off. [step] Only do this if it's going to be for several hours; turning a phone on/off actually uses a massive amount of power itself. This will probably be the most effective and simple way of conserving your battery's power.

Ending1: Why? This will help conserve energy and also charge your phone. If you don't plan on answering the phone while you're sleeping or after business hours, just turn it off. Ending2: [title] Feel the power cord, then stand behind the phone and just touch it with your hand (not a reflexology touch). [step] Only touch the charging cord and not the connecting plug strip. Ending3: If you make a habit of answering a phone only when you need to, it can make your battery last longer. [substeps] Do not answer a phone while it's going to be dead, otherwise it won't start working at all (which is not good for your battery). Ending4: [title] Detach the battery from the phone. [step] Without removing it from the phone, use a fingernail and pry away the top of the battery.

Answer format: ending1/ending2/ending3/ending4