https://qooah.com/2012/04/02/%e5%88%a9%e7%94%a8-3g-tethering-%e4%bb%a4%e5%85%b6%e9%9b%bb%e8%85%a6%e4%b8%8a%e7%b6%b2%ef%bc%8c%e8%bc%95%e9%ac%86%e6%94%b9%e8%ae%8a%e8%a1%97%e5%a4%96%e4%b8%8a%e7%b6%b2%e7%9a%84%e7%94%9f%e6%b4%bb/