I can't update my iphone 4s to ios 5.1 through my iphone

i can't update my iphone 4s to ios 5.1 through my iphone, its state that try again i do'nt know why please help me!

***ATTENTION EVERYONE!!!!!
Here are detailed step by step instructions, for these who are not exactly super tech savvy. :-)
Adjusting you DNS settings work like a charm!
Google Public DNS IP addresses
The Google Public DNS IP addresses (IPv4) are as follows:
8.8.8.8
8.8.4.4
So do this on your IOS iDevice:
-Go to settings,
-Then to Wi-Fi,
-(Find the network your connected to) touch the blue arrow all the way on the right of the Network WiFi Name,
-Go down to DNS (you will most likey see something like for example: 192.168.254.254, 192.168.1.1) in that field,
-Totally delete everything in that DNS field,
-Replace the pervious address with exactly this: 8.8.8.8, 8.8.4.4
-You are all done, just exit out.
Then just retry to check for updates and all will go smooth, the problem is - I think some ISP's have got certain Apple servers address blocked, or Apple's software servers are not registered correctly to point to the right physical location your IOS iDevice is trying to get the update from, when on certain ISP's networks. For one I am on Windstream, and it appears they have some kind of problem either blocking or not routing the IP correctly.
Thank you so much for the instructions
Worked like a charm, once again thank you..

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I can't update my iphone 4s to ios 5.1 through my iphone

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