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Information is power, and while your main access to the web might be down, you might be able to connect using the 3G/LTE network using a dongle or hotspot device. It might not be good enough for you to steam films from Netflix, but it can allow you to get access to news, weather and other information.
You can pick these up either from phone stores or online. Personally, I think it's best to get an unlocked on so you can ick and choose the provider you go with based on price and service in your area.
If you live in sunny climes then a solar charger is a great way to keep devices topped up. If I can use one of these in the UK then unless you're living down a hole you should be able to make use of one!
Portable power pack
It's easy to forget how much we rely on mains power to keep out devices running. But what do you do when the lights go out?
This is where a portable power pack can come in useful. This can be used to keep your cellphone and other gadgets charged up.
I'm a big fan of the Anker Astro external battery packs. You can get these in capacities ranging from 6000mAh to a whopping 12000mAh.