I have a problem with my iPhone 5! Can't make in-app purchases?

It started about a 6 months ago, when one day we tried to buy something from a app it just said
Your Purchase can't be completed
For assistance, contact iTunes Support
at www.apple.com/support/iTunes/ww/.
We called but it didn't help can anyone help us?!

The credit card you used to setup the itunes account has since expired?

  • Will jailbreaking my iPhone 4S allow unlimited in App purchases? I've heard yes. Also was wondering if it negatively affects my iphone other than voiding warranty? Also what program is best for jailbreaking? I'm running 7.0.2
  • On my iPhone, I get all in-app purchases for free - good apps for this? This is due to my jailbreak. I get all in-app purchases for free because of some thing I downloaded through a Cydia source repository. Anyways, any apps that this is really worth it for? So far, I've just used it for Angry Birds to get unlimited Mighty Eagles.
  • Is there a way I can delete video purchases on my iPhone so that I can't watch them even with wi-fi? In the past, I have purchased some episodes of a show that I no longer watch (nor want to think about). They're no longer installed on my phone but they'll still show up in my library because of the purchase I made in the past. Is there a way I could delete video purchases with the release of IOS 11.0.3?
  • IPhone won't let me make app purchases? I recently got an iPhone 5s, for the first week I was able to make app purchases with no problem. Now whenever I try to purchase anything I get a message stating that my Apple ID couldn't be found or my password is incorrect. I know that my password is correct (I use the finger scanner, then put manually enter in my password when that doesn't work) anyone have any idea on how to fix it?