I was at Walmart and found a USB charger that’s powered through your house’s telephone jack. It also has a micro-USB port. In the event of a power outage, you can power your phone or other devices while still having a phone line. It also doubles as a night light. I bought one, and it sure does work as advertised. We don’t have a landline, so it was wasted space. They’re in the electronics section marked as $8, but they ring up $4.