My 24month contract doesnt run out until june, upgrade available in april but I want to change over to payg with the new big data deals. Will it cost me alot to switch with so long left on my contract?
It's until the end of the contract (the "minimum term"). When you upgrade early, you get your new handset and don't start paying for it until the end of your current minimum term. The 24 months for your new contract starts from then.