What is the #1 phone in the world?

It depends what you mean by “#1 phone”:

• #1 by global sales/shipments: this changes by quarter and needs the latest market data.
• #1 as a premium “best overall” phone: the latest iPhone Pro/Pro Max and Samsung Galaxy S Ultra models are usually the safest top-tier picks.
• #1 for most people: an iPhone is often the simplest answer if you want long software support, strong cameras, great apps, and high resale value.
• #1 for Android users: a Samsung Galaxy S Ultra is usually the most complete flagship choice, especially for display, zoom camera, and productivity features.

If you mean “the most popular/sold phone in the world right now,” check the latest quarterly reports from firms like IDC, Counterpoint, or Canalys, because the leader can change frequently.