I am planning on purchasing the iPhone 5 tonight for $199 subsidized. The plan is to pay the ETF tomorrow or later in the week to cancel the contract so I can continue using straight talk. So $199+$350+$36 = $585. 1 month of service is another $90 --- so $675 tolal. This comes to less than they sell the non-contract Verizon version. ($699) My question: How long do I have to stay in contract before I cancel? Can I cancel within the first week and not have to pay the full $90 for the month's service?