Why won't my iphone update to iOS7?

I have I a iPhone 4S and I have tried updating it to the iOS7 and it then finished and then I had a pop up saying the update is not available at this time. Try again. I have tried again and it still hasn't updated?

Apparently if your battery is under 50% it won't work and also there's a lot of people trying to update their iPhones

  • Why won't my iphone let me download ios7? When i try to update my iphone 4 says that I don't have enough storage. I deleted every app, cleared cookies and history, deleted emails, songs, pictures. What do I do in order to download it?
  • Why won't my music play with iOS7? I downloaded the new iOS7 I my iPhone 4S and it deleted all my music that I downloaded for free(some off music sharing websites and some I bought from the artists' official sites). And so I downloaded the new iTunes and the music is back on my phone but it's in like a gray shade and won't play. How do I fix this?
  • Why is my iOS7 update failing:-? I have tried to update my iphone 4S 5 times to iOS7 and everytime, a pop-up come saying "Software update failed" as the title. Why is this happening and what should i do?
  • Why doesn't my iPhone 4 show ios7 update? I just heard that iOS 7 is available for iPhone 4/S, and when you go to settings-General- Software update it shows my iOS is up to date which is 6.1.3… And I just wanted to know why or is it really supported for the iphone4 I know that it lags cause iPhone 4 has a A4 chip not like the 4S which has a A5 chip…