There was very little alternative on the desktop when Microsoft was convicted. However Apple has a very strong competitor in both Android and Samsung. That's the difference.
Try reading the findings of fact and focus specifically on applications barrier to entry. Moving from iOS to Android is not nearly as difficult as moving from Windows to Linux or OS9 was in 2000.
Microsoft also deliberately, not once but three times, disrupted the development of middleware that would have made the migration easier. Now whether you think that any of the middleware (Netscape, Java and Intel's cross-platform device driver framework) was crap or not is irrelevant. Microsoft did this to prevent competitive threats from arising and to maintain their illegally gained market share.
Apple have tried to disrupt Android but have failed, and they have also not prevented software that allows cross-platform development. It's all in the findings of fact which you clearly haven't read.