I am eligible to upgrade my phone to the iPhone 6 since I've had my current 4s for 2.5 years. When I am ready to upgrade, will I be able to get the phone at the subsidized rate ($299 for 64gb) and still keep my current plan ($39.99 for 450 mins/$30 for 2gb data) without having to change to one of the Edge plans which would actually give me less data for more money.