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To make sure that the USB drivers for HTC Desire 820 are up-to-date, install
the latest version of HTC Sync Manager on your computer.
Make sure you have a USB tethering service enabled by your mobile operator.
You may need to have USB tethering added to your data plan, and it may
incur additional cost. Contact your mobile service provider for details.
Make sure that mobile data is turned on.
1. Go to Settings, and then under Wireless & networks, tap More.
2. Tap Mobile network sharing > USB network setting > USB tethering (or Mobile
network sharing > USB tethering).
3. Connect HTC Desire 820 to your computer using the provided USB cable.
The next time HTC Desire 820 connects to a computer, it will remember your
settings.