My iphone won't let me download apps?

I have a iPhone 4 and yesterday it started and it wouldn't let me download ANY new apps. So I reset my phone and it deleted all of my apps so I tried to get them back and it still will not download. Please help I've tried even resetting my Wi-Fi to see if that helps and it still wouldn't. Please please please help. My iMessage isn't even working…

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  • Won't let me download apps on iPhone 4? I just got an used iPhone 4 from my uncle and every time I try to download an app (Twitter, Netflix) It says 'This application requires iOS 7.0 or later. I can't download any apps and that really sucks, is there any way to fix this?!
  • Why won't my iphone let me download apps? I have been trying to get a free app & have plenty of storage. When i try to download the app i type my password and yet it still asks for scan. And when i type in both my password and scan that are obviously correct, it takes me back to the main screen. F iphones.
  • Why won't my iphone 3G let me download apps? I will click on an app and the install button will go really weird and ike half the writing will be covered up and i then won't let me press it! Its really annoying me! and hopeully its got nothing to do with updating my phone because i can't because it will brick it
  • Why won't my iPhone 4 let me download anymore apps? All of a sudden everytime I try to download a app from the app store my Phone keeps saying "not enough local storage". Usually I just delete some things off my phone and that helps but not in this case. I called apple support and they werent much help at all. I tried to clear up iCloud a bit to make more room for storage but that didn't work either. I dnt know what else to do I need help please