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What was the $150 for? I'm sure AT&T told you what you were paying for.
Did you start a new plan? Or did you trade in your existing phone but keep your old plan?
There's many reasons why you would have needed to pay $150, which would not necessarily mean its a down payment for the payment plan.
Question: If I wanted to get new iPhone 7plus with payment options, how much would I have to pay up front first?