In Pictures: Swiss Army smartphone - 7 tools your phone can replace

With the right apps, cases and add-ons, your smartphone can tackle a wide and whacky range of tasks.

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Self-defense device Unless you're one of Edgar Rice Burroughs' four-armed Green Martians, or an octopus, juggling a phone and protective pepper spray when walking through unsafe areas can be difficult.

Problem solved -- Spraytect's Self-Defense iPhone Case (for iPhone 4/4s, $39.95) includes a detachable pepper-spray cartridge holding a proprietary blend of habanero and other peppers. According to Spraytect, the range of a spray is 3 to 7 feet. (Note, the cartridges meet TSA checkable-luggage guidelines.)

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In Pictures: Swiss Army smartphone - 7 tools your phone can replace

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