A 0% purchase credit card lets you spend money and make repayments without any interest for a set period.
Given that Sky Mobile has approximately three million customers, it is estimated that up to one million customers could see their bills increase.
A zero-interest credit card can be useful for buying pricier items if needed, but users should beware spending more on the card and plan to pay it off by the end of the term.
You can usually apply for an interest-free credit card online or at a bank's branch - but be aware of when you need to start spending or moving money by, as you could lose the offer if you fail to do this within a certain window.
The best interest-free credit card deals will be offered to those with good or excellent credit scores.
