Are you looking to purchase the new phone outright entirely, or purchase it on a contract? If you'd like to purchase the iPhone 6 on a new contract (ie. not initially outright paying for the iPhone 6), then the costs to leave the contract you're currently on with your iPhone 4 can be calculated based on the cost of the iPhone 4 at the time you signed your contract and how much you paid to obtain the device. You can visit our page here, for how to do this calculation. Up front costs for the new phone include a one time hardware activation fee of $40 and the discounted purchase price of an iPhone 6 (because it is purchased on a contract, this will be much less than the actual price of an iPhone 6). If you have any further questions, let me know and I’ll be able to assist or an employee at any MTS Connect store can also help you out with determining this total as well.