How to share my laptop internet with my iphone 4?

My laptop is using Wi-Fi internet so i want to sync my iphone to my laptop in
order to use that Wi-Fi connection.

I can't connect my iphone directly to the router for very long as i keep losing signal as the router is quite far away however my laptop has no problem

You may want to set up an Ad Hoc Wireless Network and share it. See links for the tutorial

Which operating system are you running on your laptop? If on windows then you may proceed to the tutorials.

http://mobileoffice.about.com/od/internet-sharing-tethering/ht/how-to-set-up-an-ad-hoc-wireless-network.htm
http://www.labnol.org/software/ad-hoc-wireless-network-in-windows-xp/11486/

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