Why does my iphone 6splus keep wanting me to add credit card doesn't give me A no credit card option?

Why does my iphone 6splus keep wanting me to add credit card doesn't give me A no credit card option?

According to their faqs,

"If you're using the iTunes Store or App Store for the first time

If you're using the store for the first time with an existing Apple ID, you must provide a payment method. After you create the account, you can change your payment information to None.

If you're creating a new Apple ID, you might be able to create an account without entering your credit card details."

So you must add one initially. It is probably a form of age verification - they don't actually explain though on the site.

Some tablets do that so that you can add apps and never realize it so the web sites want your money.
If you have already given them a credit card?
Some get a credit card with a very small amount on it that you can afford to loose. Anytime you put a credit card on the internet do not use on with a balance you can't afford to pay.