How to fix unable to download application APP could not be downloaded at this time?

On my iPhone 4s I tried to download a couple apps in the last couple of days, both pertaining to photography and photo editing, and with both apps I got the same message:
"Unable to download Application"
"Photo Editor+" could not be downloaded at this time."

and then I have two options: "done" or "Retry"

one of these apps was free, however the most recent one was not. Is there a way I can fix this?
I have the most recent software: iOS 5.1.1
It's not jailbroken, and I don't seem to have issues with any other apps or iTunes store for music.
Ok, I take that back, I've now received a message when I tried to download a game:
"MZCommerce.CreditBalanceMismatch.mobi…
And the only option is to tap "OK"
so i tried to re-download it, and it gives me that very first message I described above.

I have the same problem right now it just happened all of the sudden?

Yep.Me too. I think something is up with Apple's servers.

I'm on iOS 6 and it's not working.

I'm sure it'll be back up soon, you just have to wait it out.

I'm on ios 7 and doesn't work why

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