Some wireless carriers in the US charge customers $15 or more per month for the ability to share a smartphone's internet connection with a computer. In other words, if you pay for 5GB of data per month, you still have to pay another $15 per month if you want to use your phone as a modem to get your laptop...
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Tether your phone to a PC without carrier restrictions with ClockworkMod Tether is a post from: Liliputing