IMac wifi to Iphone4

Hey guys.
I have an iMac 27inch 2.8 Core i7 and have recently brought an iPhone 4.
My iMac is using the internet via the ethernet on the back and have set my iMac to share my internet connection via airport so i can connect my iphone to the internet.
Recently my iphone wont connect to the itunes store or the internet. for about 2 or 3 seconds the app store works but when i try to download an app simple comes up with 'cannot connect to itunes store'
it used to work fine but not any more. the safari wont work or facebook. just wondering whats happening? i dont have a wireless router and dont have access to the router.
My iMac is at work so thats why i dont have access to the router! the techs dont think its a good idea me getting into it.
Any thoughts?

I would start by re-starting the iMac. Then:
1. Check the iMac sharing internet settings
2. Recheck your Airport settings
3. Reset the network settings on the touch
Your iMac is plugged in to your network via Ethernet, correct?

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I already use a specific channel that I've used for 2 years in this building (channel 4). That gets me the best signal by far and saturates my bandwidth.
So, my connection doesn't "drop" or get lost when sitting idle for a few hours, it says it's still connected to my router, but there is just no data going through. Safari just sits there trying to load a page, same with Mac Mail, no network activity.
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http://support.apple.com/kb/HT4628
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Click on the link to see more details and screenshots.
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http://support.apple.com/kb/ht3728
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