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If you go on vacation or a business trip, chances are you're going to need a data cable for your phone anyway, and an extra can't hurt. But a power-only cable is a handy way of securing your phone no matter what out-of-the-way, dodgy hotel or airport you end up in.
Some people call these "USB condoms," usually referring to a dongle that you can buy that blocks data from being transferred over the USB connection. In this case, "data" equals malware. Is a foreign government or hacker group building in standalone devices to push malware to your phone? Do credit-card skimmers exist? Okay then. If a malicious cable can be used to conceal malware, the wall port sure can.
I recently returned from a pair of trips to Arizona and Hawaii, and had planned to invest in a data-only USB-C cable anyway. As it turned out, Plugable alerted me about its entrance into the market, and asked if I'd like to try one out. The company offers a few cables of different lengths, and I think that Plugable's $15.95 6-foot-cable works best, if only because it accommodates awkwardly placed outlets in airports, airplanes, and hotels. (There are also cheaper, shorter options.)
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