In short: It’s no surprise that regularly updated applications and services are dropping support for older hardware and operating systems. WhatsApp users with older iPhones should mark the end of service on iOS 10 and 11 on their calendars this fall.

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This week WABetaInfo received screenshot of WhatsApp alert sent to iOS users. Starting October 24, the app will only support iOS version 12 and above. WhatsApp Help Center and iTunes Pages list iOS 12 as the oldest compatible version.

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WhatsApp has been supporting iOS version 10 and up since March last year. The ditching of iOS 10 and 11 means that users who still have an iPhone 5 or iPhone 5c will have to back up their data and update their phones to continue using WhatsApp after October. The oldest iPhone that can run iOS 12 is the 5s.

WhatsApp seems to change its oldest supported firmware about once a year, in sync with Apple stopping security updates. Apple’s iOS 12 is the oldest version and has received the latest security updates, the latest being iOS 12.5.5 from September. The latest iOS 11 update was in 2018. Ironically, iOS 10 received its last update in 2019.

Deadline coming almost a year after WhatsApp out of production Android 4.0.4 support last November. Including iOS 12, the oldest mobile operating systems running WhatsApp are Android 4.1 and KaiOS 2.5.0 and newer. Telegram Messenger still has support going back to iOS 9.