Apple's fears of the global chip shortage impacting its ability to manufacture enough iPhone 13 models is starting to materialize. According to Bloomberg, Apple is said to have been forced to scale down its iPhone 13 production by as many as 10 million units as chip shortages have started to bite.
https://www.notebookcheck.net/Bloomberg-Apple-s-fears-of-a-chip-shortage-affecting-iPhone-13-production-have-materialized.571908.0.html