This article explains how to connect a Bluetooth-enabled mobile phone to a computer and access the Internet.
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Using your Bluetooth-enabled cell phone as a modem to access the Internet on your laptop is great in an emergency situation when Wi-Fi service is unavailable or your regular Internet service is down. However, any data downloaded and uploaded to your laptop will use your phone’s data plan. Keep an eye on your data usage to avoid unexpected overage charges or data caps.
This method involves pairing your phone with your computer and connecting them over a Personal Area Network (PAN).
Enable Bluetooth on your phone (usually found in the Settings menu) and make sure your phone is visible to other Bluetooth devices.