How much will it cost to buy an iPhone 5s and switch that phone onto my contract?

Hi, I'm Olivia, I want to buy an iPhone 5s and switch it onto my contract with Telus. My contract is a student contract. I get 10 favourite contacts, I can call anytime, anywhere in Canada, I have unlimited texting in Canada, I have free calling on weekends and after 6:00 and I have 1GB of data. The cost per month is about $55. So my question is, is how much will it cost to buy an iPhone 5s PLUS switch it to my contract I just described? (By the way, I currently have an iPhone 4s)

Please give me a rough amount.

It should cost about $199.99 but your getting ripped off for your plan. I have verizon and I get 1400 minutes of calling all the time in America, unlimited text in north anerica, and 2gb of data in American for $40 but yeah it should cost about $199.99