6 Android apps that turn your phone into an offline survival kit

The power goes first, and the street changes character in seconds. Traffic lights blink off, storefronts vanish into the dark, and mobile signal bars begin thinning out one by one. You reach for your phone out of habit, only to find Google Maps half-loaded, messages hanging on “sending,” and half your apps staring blankly at servers they can no longer reach.

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