I'm pretty sure Apple doesn't need a monopoly on the entire smartphone market to have monopoly power...

Apple already got in trouble for price fixing - a violation of the Sherman antitrust act. https://en.wikipedia.org/wiki/United_States_v._Apple_Inc.

Related to iOS and competition within it, see

http://fortune.com/2016/06/30/elizabeth-warren-apple-google/

http://www.thehill.com/opinion/op-ed/272399-time-to-prosecut...

Hopefully more to come from me on this topic...my channel here. https://medium.com/@ryanpollock