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At one point, tethering was a simple process - installing a program from the Android Market would enable the feature and you were good to go. Of course, carriers didn't like this, because instead of paying them an extra $30(ish) a month to use their hotspot service, you were gaining access to the feature for free. So they had many tethering apps pulled from the Market. Not only that, but many carriers put a block directly on devices that disallowed the use of common tethering apps.