Review: OnePlus 3 is a flagship phone for careful spenders

The OnePlus 3 smartphone raises two difficult questions: Just what is a flagship product? And why should you care?
Flagship phones -- the ones with the fastest processors, best screens and slimmest profiles -- tend to cost about $800 and often still tie you to carriers. The OnePlus 3 costs just $399 (vendor price) and packs tech that's as powerful as any of them. It gets you 95% of the way to a deluxe smartphone for half the price. And it comes unlocked and without bloatware.
Physically, the ph