You can share your phone's data connection through USB, Wi-Fi, or Bluetooth. Go to Settings, tap More > Mobile network sharing, and then choose whether to share via USB tethering, Portable Wi-Fi hotspot, or Bluetooth tethering.
A data connection such as 3G/GPRS is required. Contact your mobile operator for information on data charges. Extended use of your data connection, Wi-Fi, or Bluetooth may drain the battery faster.