Your PC cant run with a power outage but if you have a corded phone you can still use it to call out in case of exergency. Besides a Cell phone. Since a corded phone draws its power right from the phone line you can still make calls in a emergency. So there are still major reasons to keep your phone service. Other than the 911 emergency service.
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Phone: LG Optimus G Pro
Running: Stock JB from LG with Nova Launcher