As if we needed more confirmation that iPhone sales aren't doing as well as analysts expected, an index of 19 Apple suppliers tracked by Nikkei, is showing a revenue slump for the first time since 2016.

The Taiwanese company Catcher that makes the metal frames for the iPhone X, had a disastrous 28% decrease in December revenue and the iPhone camera lens maker Largan Precision managed to beat it with 33.86% drop in sales then.

The revenue of Apple's chief assembler - Foxconn - fell 8.27% in December from the same period last year, too, which the company ...