How to connect my iphone to my laptop to use my laptops internet?

I using a dongle abroad and want to connect my iphone to my laptop and use the laptops internet connection for my phone? I've tried ad hoc but my phone just keeps saying unable to join network?
Cheers

You can't do it that way. And if the laptop's wireless interface is being used to connect the laptop to the internet, you can't do it at all.

If the laptop is connected to the internet using the wired connector or a separate USB device, then you can set up Internet Connection Sharing on the laptop and connect the phone to the laptop's wireless using ad-hoc.

It is very easy to do that you just need to download an iphone file manager