How do I share Internet on my laptop's WiFi connection using a mobile 3G- or 4G-modem?

I would like to connect my iPhone to my mac laptop through WiFi and access its Internet.

or android mobile to window 7,8,8.1,xp,vista,10 

You can setup an Ad Hoc network connection by following the directions below:

Windows 7

1. Open the Start Menu.
2. Click Control Panel.
3. Click Network and Internet.
4. Click Network and Sharing Center.
5. Under Change your networking settings, click Set up a new connection or network.
6. Select Set up a wireless ad hoc (computer-to-computer) network.
7. Click on Next twice.
8. Enter the Network name such as "LogicNetwork".
9. Select the Security WAP (or WEP).
10. Enter the Security key or password.
11. Check Save this network check box.
12. Click Turn on Internet connection sharing.

Continue with Part 2 below.Part 2: Connect your mobile device

1. Tap on the Settings icon in your iPhone main menu.
2. Click on Wi-Fi.
3. Your ad hoc network "LogicNetwork" should appear in the list.
4. Click on you network.
5. Enter the Password.