If Apple said to Verizon, AT&T, or T-Mobile that they could only sell iPhones if they only sold iPhones and _then_ used that position to bundle other services they would look like Microsoft. I could see potentially on the supply side (buying all of TMSCs most cutting edge capacity) Apple has that power, but on the consumer side they have no price control in any market (Apple products are not a market).
It's a strained argument to say that if they hadn't have put the OEM agreements in place that they would've been completely unchecked by the antitrust authorities in the browser market.