According to reports, Apple may skip releasing an iPhone 19 model in favor of introducing an iPhone 20 next year.

To celebrate 20 years of iPhone, Apple plans a radical design change for 2027.
Apple Set to Mark 20-Year iPhone Milestone with Substantial Design Overhaul in 2027"
In a move marking the 20th anniversary of its iconic iPhone, Apple is preparing for a significant design shift in 2027. According to sources close to the tech giant, the revamped iPhone model is expected to showcase substantial aesthetic and functional changes.
Details surrounding the revamped iPhone are still under wraps, but industry insiders speculate that Apple's overhaul will incorporate cutting-edge display technology and streamlined hardware. This major redesign is intended to underscore the brand's relentless pursuit of innovation.
While specific features and technical specifications have yet to be revealed, analysts believe the updated iPhone model will aim to appeal to a new generation of users while maintaining Apple's strong customer loyalty.