i cannot update my apps from the itunes store and my phone keeps telling me to update my billing info which has no problem at all

If you are getting a message about your payment details being invalid then that is why you can't download app updates. When you have a card on an account it has to be a valid card and pass the iTunes store validation - that applies whatever you are trying to download, including app updates. And it doesn't really matter whether you've been using the same card since you bought the phone, validation rules can change, what is/isn't accepted by iTunes can change. If you go to the payment details screen on the account as prompted are there any error messages ?

What are the error messages that you are getting ?

For the 'invalid', that means the card is not valid for use with iTunes.

Either try a different card, try removing the card (assuming that 'none' shows as an option) and re-entering its details from scratch, or just leave it as 'none' (that should let you download app updates).

The card may be valid elsewhere, that doesn't automatically mean that it's valid for iTunes and satisfies their current validation. You were able to select the 'none' option on the account and save it ? Have you tried logging out and back into the account since then and/or tried adding the card back (possibly via your computer's iTunes instead of directly on the phone) ?

You've tried a different card, and they are one of the types listed on the payment details screen on your account on your computer's iTunes ? And the cards are registered to the same name and address as on your iTunes account and were issued by a bank in the country where you are (and which is therefore the country on your account) ?

I'm having the same problem and im garunteed my card is correct ive used it on other websites, is their a fix?

Why can't you updated the apps ? If you go to the payment details screen are there any errors (when you have a card on an account it has to be a valid card, whatever you are downloading) ?

I've tried all of that in wven tried Munich brothers Samsung instead of my iPhone... I don't know the problem