Sept. 12 (UPI) -- Apple is postponing the release of the latest version of its iPhone in China over regulatory issues related to the company's eSIM, a digital version of a traditional SIM card used in wireless phones.

China's three large telecom companies have yet to obtain the necessary approval from the country's government to sell devices using the eSIM technology.

Apple China's website has a message that says "release information will be updated later," for the new iPhone Air.

The California-based tech giant announced this week it would start selling the ultra-thin iPhone Air, as well as the new iPhone 17 Pro and iPhone 17 Pro Max models, on Sept. 19.

Global pre-orders for the devices began Friday.