If you have a laptop but don’t have the modem for an Internet connection, you can use your phone as a modem. Tethering refers to connecting one device to another. In the context of mobile phones or Internet tablets, tethering allows sharing the Internet connection of the phone or tablet with other devices such as laptops.
On an Android phone, there are several free apps that you can use for tethering, you can choose the one appropriate Android Tethering app with the connection method you use, whether it is via Wifi, USB or Bluetooth.
1. WiFi Tether for Root Users