I still have the iPhone 5 with AT&T and the unlimited data plan. I feel it's finally time to upgrade and decided on the iPhone 6S Plus. I thought I wanted the 128GB version but that's one expensive phone, and after thinking about it feel the 64B version would work for me. My question is, where is the best place to buy from? I've looked at Costco, Best Buy and Apple online. I thought Costco would have a deal but they don't. I know I'll be losing my unlimited data but I'll be gaining unlimited text and the service rates will be lower, even though my monthly bill will be higher due to the cost of the phone added in. I do worry about having limited data, even though most of the time I'm under 1GB. I wanted to switch to Verizon for the coverage, but their data plan is so much more expensive, so I'm sticking with AT&T. It's so confusing.