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Yes, there are such devices called personal hotspots or MiFis. They basically connect to a 3G or 4G signal and then create a wireless access point for you to connect your wifi devices to. Another way for you to do this would be for your smartphone to act as a personal hotspot (aka: tethering), which a few other people in this thread have already mentioned that they do. It works basically like the the personal hotspot devices that I mentioned above, but it usually requires you to either pay your service provider a monthly fee or requires you to modify the smartphone's software.
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