Apple's iPhone 6 pre-order launch was a success, with more than 4 million sales in the first 24 hours.
All the pre-sale units have now been sold out and are on backorder, which may last for up to 4 weeks, depending on the model you are after.
Meanwhile, Apple's main device assembler – Foxconn – is struggling to meet the demand for the new smartphone models.
The manufacturer has 100 assembly lines running around the clock in its largest production site in Zhengzhou, China.
An anonymous source told The Wall Street Journal that all this effort yields 400,000 iPhone 6 models and 140,000 iPhone Plus models per day. As a result, the waiting time for iPhone 6 models is listed to be around a week, whereas the apparently-harder-to-produce 6 Plus models will take 3-4 weeks to get to the hands of anyone who orders them now.