How to do this without spending too much money?

I currently have a blackberry which I absolutely dispise. I'm under contract with it for another year and a half however I want to end the contract and purchase an iPhone 5s.

The iPhone cost around $200 under contract which is $75 each month for 2 years. It costs $700 without a contract. I'm not willing to pay $75 a month for it and the full price of the phone is just too much.

How can I end my contract without having to spend a great deal of money? And is it possibly to buy the 5s under contract and unlock/break the contract?

Usually you can't come out of the contract until it expire. You have to put forward a request to your SP and terminating contract will end up in contract termination fee. Instead of getting an iPhone you can simply get your Blackberry phone unlocked using codes that might be available at any online vendors like http://www.unbblock.com/blackberry/rs18wp8 This will save your money, coz early termination will cost fortune