Error Occured Installing iOS 5.1 on my iPhone 4S, how do i fix this?

I was able to download iOS 5.1 via wifi on my iphone since March 7, but after downloading, it keeps on saying that an error occured installing iOS 5.1. How can I fix this? been trying to download it on my pc but it takes a while. the file is almost 1GB unlike ota update on my iphone, its just 183MB.

Next step in troubleshooting is a reset. You hold the sleep/wake and home buttons together until you see the Apple logo and then release. The phone will restart. This will not have any affect on your data. If this doesn't help, the next step is a restore, however before I did this, I would call the carrier. Most SMS/MMS issues can be traced to the carrier. They may have to reset SMS on their end.

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