Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to check esns [title] Remove the back cover of your phone. [step] Take off the back cover of your phone by prying it off the casing. [title] Remove your phone's battery.

Ending1: [step] Once everything is off, you'll be able to tell the tell-tale sign that the device is running. [substeps] If you hear a beeping sound, the device is powered on. Ending2: [step] Once you've removed the back cover and exposed the back, take out the phone's battery. [title] Check your phone's esn. Ending3: [step] Unscrew the battery, which usually comes out the front. Make sure not to release the charger cable. Ending4: [step] If your battery is free from charge, it is safe to empty your phone and take it out, but if not, contact the local phone company and ask for a replacement battery. [substeps] You should also check if your phone has a paper cover.

Answer format: ending1/ending2/ending3/ending4