Apple has fired off invitations to a 15 September online event expected to introduce a new-generation iPhone tailored for 5G telecom networks.

The typically tight-lipped technology titan revealed only that the presentation would be streamed starting at 6pm Irish time from its headquarters in Silicon Valley.

Copies of the emailed invitation spread quickly on social media, featuring a video-snippet version of the Apple logo in blue that unraveled into the event date.

The invitation was also posted at the Apple website, where the event will be streamed.

Apple has routinely held events this time of year to unveil new iPhones, and expectations are that this time around the spotlight will shine on a 5G model, with other new handsets possible as well.

A new version of its Apple Watch is also likely, as well as possible upgrades to its iPad line.

Wedbush analyst Daniel Ives said in a note to investors that a check of Apple's supply chain in Asian has strengthened his confidence in a iPhone 12 "supercycle" kicked off by the release of several new models in October.