The reason for the resignation of Chialin Chang is not clear but as per sources, he has resigned because of his personal carrier plan.
So far, HTC has not named a successor to Chang.
On the other hand, Chang's position with HTC was no longer as relevant as it used to be.
His position seemed useless as HTC sold nearly all of its smartphone design and engineering team to Google. The company hasn't revealed any replacement for Chang yet.
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HTC said it is a personal career move, while media reports indicate Chang intends to launch an AI startup in the future. HTC's smartphone revenue has declined significantly over the years, and isn't showing any signs of improving.
As for the smartphone market of HTC, it has not completely ended its business.
KitGuru Says: HTC's smartphone sales have been dwindling for years and now with most of the company's smartphone team gone, it wouldn't be surprising to see them drop out of the phone business.
HTC may not launch its next flagship at the upcoming Mobile World Congress 2018 later this month, but it should formally unveil it shortly afterward.
HTC has been struggling in the smartphone sector and according to the latest info, in 2017, lost around $103 million in Q3.