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Tethering, or phone-as-modem, is the sharing of a mobile device’s Internet connection with other connected computers. Connection of a mobile device with other devices can be done over wireless LAN, over Bluetooth or by physical connection using a cable, for example through USB.

https://en.wikipedia.org/wiki/Tethering

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Android

Step 1: Turn on your phone’s hotspot

1. Open your phone’s Settings app.
2. Tap Network & Internet  Hotspot & tethering.
3. Tap Wi-Fi hotspot.
4. Turn on Wi-Fi hotspot.
5. To see or change a hotspot setting, such as the name or password, tap it. If needed, first tap Set up Wi-Fi hotspot.

Tip: If you don’t want your hotspot to require a password, pick None under ‘Security’.

Step 2: Connect another device to your phone’s hotspot

1. On the other device, open that device’s list of Wi-Fi options.
2. Pick your phone’s hotspot name.
3. Enter your phone’s hotspot password.
4. Click Connect.

Tether by Bluetooth

1. Pair your phone with the other device.
2. Set up the other device to get its network connection by Bluetooth. Follow the instructions that came with the device.
3. Open your phone’s Settings app.
4. Tap Network & Internet  Hotspot & tethering.
5. Tap Bluetooth tethering.

Tether by USB cable

Important: Mac computers can’t tether with Android by USB.

1. Using a USB cable, connect your phone to the other device. A ‘Connected as a…’ notification shows at the top of the screen.
2. Open your device’s Settings app.
3. Tap Network & Internet  Hotspot & tethering.
4. Turn on USB tethering.

Expect high battery use by tethering

Tethering can use a lot of battery. We recommend:

• Plug in your devices while tethering.
• Turn off tethering connections when you’ve finished with them.
• If your phone can turn off your hotspot for you when no devices are connected, turn on that setting.

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iPhone

Open the iPhone’s Settings. You can find the Settings app on your Home screen. The icon is a grey gear.

Tap the Personal Hotspot option. This can be found in the first group of options in the Settings menu.

• If you don’t see this option, tap Mobile Data and then tap Set Up Personal Hotspot. You may be prompted to call your carrier to subscribe to a plan that supports the Personal Hotspot feature. It may require an additional fee.
• If you don’t see the Personal Hotspot option anywhere, either on the main Settings menu or in the Cellular menu, you’ll need to contact your carrier.

Enable the Personal Hotspot switch. It will turn green. If your plan does not support tethering, or additional confirmation is required, you’ll be notified to contact your carrier before you can proceed.

Tap the Wi-Fi Password button. This will allow you to change the password that is required for your network.

Tap Done. This will change the password for the wireless network.

Open the list of available networks on another device. The process for this varies depending on your device, but you’ll be connecting to your iPhone like you would any other wireless network .

Select your iPhone from the list of available networks. You’ll see your iPhone listed as one of the available wireless networks. The network name is the same as your iPhone’s name.

Enter the password you created when prompted. This password is required to connect to the network. You can check the password at any time on your iPhone in the Personal Hotspot menu.

Test your internet connection on the connected device. After connecting to the wireless network, your device will be able to use your iPhone’s internet connection to browse the internet. Be aware that using your computer on your iPhone’s data connection will eat up a lot more data than using a mobile device.