iPhone manufacturing facility violence: Fault lines run deep among contract workers At Wistron's iPhone manufacturing facility in Karnataka, property and goods worth crores were vandalised. Payment delays and the failure of the company to resolve the issue are believed to be triggered the violence. December 15, 2020 / 02:54 PM IST Close to 1,500 people were involved in the violence on December 12 at the iPhone manufacturing facility of Wistron Corporation in Naraspura, Karnataka. It was the start of another busy day at the iPhone manufacturing plant of Taiwan tech giant Wistron Corporation in Karnataka’s Naraspura on December 12. The night shift workers were about to leave when violence broke out.