A customers holds the new green colour Apple iPhone 13 pro shortly after it went on sale inside the Apple Store on 5th Avenue in Manhattan in New York City, New York, US, March 18, 2022. (Photo: REUTERS)

An outbreak of COVID-19 in China has kept its financial hub Shanghai largely paralysed by a city-wide lockdown — now in its seventh week.

Beijing, meanwhile, has ramped up its quarantine efforts. The iPhone maker's supplier Foxconn has been able to keep its workers on-site in a "closed loop" system to limit the impact on production, but lockdownshave pushed many to sound demand-related warnings.

Apple had also said last month any new lockdowns in China and Chinese Taipei, where many parts and iPhones are produced, could bring new obstacles in terms of supply and demand in the current quarter.