In the weeks since Apple released iOS 10, the next-gen operating system has been installed on 54 percent of active iDevices, according to Cupertino.
Those numbers, however, are lower than recent data from analytics firm Fisku, which this week counted 67.7 percent adoption; Mixpanel reported a similar 67.27 percent on Monday.
Cupertino's latest mobile update, released to the public on Sept. 13, features improvements to 3D Touch, the lock screen, Messages, Maps, HomeKit, Photos, Siri, and more.
But iOS 10 suffered some early installation issues (including an iMessage GIF search glitch that surfaced hard-core porn), which may have discouraged some users from immediately updating.
Last month, T-Mobile warned iPhone 6, 6 Plus, and SE owners against downloading the new OS, following reports of lost network connections. Apple later patched the issue.
Now, the upgrade has beaten iOS 9—which in 2015 became the company's fastest-adopted operating system ever, topping 50 percent in only five days. But, based on Fiksu data, it counted only 61.9 percent of usage in the same 28 days after launch.
"If this uptick is more than just a temporary change, it indicates good news for Apple going into the crucial holiday season," Fiksu Director of Marketing Jeremy Sacco wrote in a blog post. "It probably means the public reaction to iOS 10 is going to stay strong."
Consumers should, however, remain alert when using the new operating system. A Russian company that sells iPhone hacking software last month warned of weak encryption that makes it easier to access a password-protected backup. Cupertino promised a fix in an upcoming update.
For more, see PCMag's reviews of Apple iOS 10 and the Apple iPhone 7, as well as the slideshow above. Also check out How to Get iOS 10.