We used to live in simpler times. Five years ago, there was only one iPhone, one Palm Pre, one Nokia N8, and one Xperia X10. Each mobile company’s flagship phone was readily identifiable. But then 2011 and the inexorable rise of Android happened, and now the very idea of a flagship is starting to feel dubious. Is LG’s best phone the G4 or the V10? Is Samsung’s flagship the Galaxy S6 or the Note 5? And which iPhone is Apple’s most important one?