e_c is right. The Unlimited Anytime Plan is no longer available for sale. BT don't automatically switch customers to restructured products, irrespective of whether the terms have or not; maybe Ofcom will get round to requiring providers to notify customers if more advantageous deals are available, as they are in the energy market. Meanwhile, you are likely to be able to move to Unlimited Anytime Calls but it will almost certainly require a fresh minimum-period contract. Call the Options Team 0800 800 030 to see what they can offer; be prepared to haggle.