in the iOS 12.5.8, iOS 15.8.6, and iOS 18.7.4 release notes, Apple says:
This update extends the certificate required by features such as iMessage, FaceTime, and device activation to continue working after January 2027.
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The implications of this update are insane and scummy tbh. essentially anyone on a device that can support iOS 26 will be forced to update to a later version by January 2027 or apple services will stop working. And you can’t update to these newest versions with latest certificate *unless* you have a device that only goes up to 12/15/18 geez.
So if you’re staying behind purposefully on say iOS 18, even the last one you could grab 18.7.3, you only have a year before you can either OTA to some extended support EOL iOS 26 security update or presumably iOS 27 by then since we are talking about Jan 2027 deadline
EDIT 2/4/26:
Upon further review, there is also past precedent for this in iOS 7 days despite peoples' repeated, committed denial of it (or in many cases incorrectly interpreting the 'argument' I've outlined based on release notes and 18.7.4 that has the new certs not being signed specifically for IOS 26 capable devices):
While FaceTime does work with iOS 6.1.6, that particular update is not available to recent devices that are able to run iOS 7, which means iOS 6 users with newer devices who wish to access FaceTime must upgrade to iOS 7.
iOS 6 Users on Devices Able to Run iOS 7 Must Upgrade to Fix FaceTime
Apple today released a new support document, detailing the issue behind the recent problems some iOS 6 users have been experiencing with FaceTime. According to Apple, a bug resulting from an expired device certificate has rendered FaceTime unusable on older versions of iOS and the only solution...
EDIT 4/1: due to massive onslaught of DarkSword exploits Apple shifted gears and released iOS 18.7.7 for iOS 26 capable devices for people still on iOS 18 and earlier versions
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