I charge my cell phone in the kitchen, downstairs from my bedroom. I have GE Zigbee bulbs in the bedside stand table lamp. If I turn off the light using the pull chain, I have to remember to turn it on again in the morning, then turn it off with the app when I get my cell phone again.
I kept my old cell phone after I upgraded over a year ago. It has no cell service, but does have wi-fi!
I downloaded the app, and now I can turn off the light with the app, check to see if I closed the garage door, and check the status of my front door lock, among other things. I keep it turned on and plugged in next to my clock radio.
A great use for what has just been a paperweight until now.