Why won't IOS 7 install on my iPhone 4S?

I downloaded it just fine until it needed to install is it because many people are downloading and installing it at the same time?

Just try over and over again. It took a few tries to update my iPhone 4 and iPad 3, but they are both updated.

Try plugging it in to charge, if it still won't update wait until its at least 50% charged and try again

The next move if that does not work is to plug it into your computer and update it via itunes

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