Most likely, support for the most recent iOS will be dropped in 2025 for the XR and XS, and in 2026 for the 11 and 11 Pro (though it is possible that they would drop all of them in 2025).I snagged two iPhone 11s for my daughters since they were a great deal on Swappie. These phones are more than enough for what the girls need, but I'm curious how long they'll keep getting new iOS updates. Anyone have any insights?
Afterwards, you can expect about two more years of security updates and support for most third-party apps for a little bit longer.
For comparison, the iPhone 6s was released in 2015, it could run the latest iOS until 2022, it got security updates until 2024 and it is the oldest iPhone right now which still has support for most third-party apps.