China's restrictions on iPhones for government employees have led to a sell-off in global tech stocks and a decline in Apple's share price. This comes amid tensions between the US and China and competition from Huawei, who has launched new smartphones. The extent of the restrictions on iPhones in China is currently uncertain. Restrictions on Huawei's chip supply show the impact of rising US-China tensions, with the US seeking to limit China's access to key technologies. A teardown analysis of the Huawei Mate 60 Pro indicates China's advancements in the semiconductor industry.