As practical as it is elegant, the SpareOne Phone is an in-case-of-emergency phone everyone should have on hand. It lasts for 15 years on a single AA battery and accepts all SIM cards so you can dial contacts if your smartphone is lost, dead, or broken. Placed in your glove box or pack, and it'll serve as a fail-safe. Best-case scenario? You never have to use it. [$100; spareone.com]
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