Yes, it was perfectly fine to install iOS 15 on an iPhone 11 when it was released, as the iPhone 11 fully supports it and later versions; however, you can't install only iOS 15 now because newer iOS updates (like iOS 17 and even iOS 18/26, per current info) have superseded it, so your iPhone 11 would update to the latest compatible iOS version for security and features.
All iPhones and iPod Touches that support iOS 13 and iOS 14 support iOS 15. However, devices with an A9, A10 Fusion, or A11 Bionic SoC have limited support, while iPhones with an A12 Bionic SoC and later are fully supported.
It's no longer possible to install 15 on an iPhone 11. To update to 17.5. 1, use a computer or the Software Update function in Settings.
Similar questions An iPhone 11 can only be updated to iOS 17.2. Go to Settings > General > Software Update. If you are asking about the iPhone 6 listed in your profile, this model of iPhone cannot be updated to run iOS 15. The best that the iPhone 6 can do is iOS 12.5.
More on that below. Read on to find out which iPhones are supported with the latest operating systems, and which are supported for servicing and repairs. Macworld's advice: The iPhone XS and iPhone 11, and any older iPhone should be avoided as can't run the 2025 iOS update: iOS 26.
Go to the Settings app on your iPhone. Tap General, then tap Software Update. The currently installed version of iOS is shown, and whether an update is available. If an update is available, tap Download and Install, then follow the onscreen instructions.
When an iPhone becomes obsolete, Apple will no longer support it with repairs or iOS security updates. This is a major issue, as if you can't receive security updates, your iPhone will no longer be secure. If you can't update your iPhone, attackers can take advantage of security holes to install malware on your device.
While updating your iPhone may seem inconvenient, it's necessary to ensure optimal performance, privacy, and security. Neglecting updates can lead to a sluggish phone and potential security risks, making the brief inconvenience of updating well worth the effort.
2. Is the iPhone 11 still supported by Apple in 2025? Yes. The iPhone 11 runs the latest iOS 26 in 2025 and is expected to receive updates for at least a couple more years.
Apple said some features might need more resources to function, so depending on how much you use your iPhone, you might "notice a small impact on performance and/or battery life." So while your device might experience some additional battery drain at first, it should be a temporary issue after you download iOS 26.2.
Apple has officially rolled out iOS 26.2, but don't expect to see that update notification if you're holding onto hardware older than the iPhone 11. In fact, you may not have access to the iOS 26 update at all.
Rapid Battery Drain
So, if your iPad/ iPhone is draining the battery faster after the iOS 15 software update, you shouldn't panic. Though a software bug could most probably be behind the issue, you shouldn't overlook other power-hungry features.
Excellent software support: As of 2025, the iPhone 11 supports iOS 18, ensuring users have the latest features and security updates. Apple's commitment to software updates extends the phone's usability, providing a fresh and responsive user interface years after its release.
These outdated operating systems don't receive updates such as important security patches. As a result, the phones are vulnerable to known attacks. While malware targeting iOS is limited, Android malware is widespread and creates a high risk.
The following iPhone models are compatible with iOS 15: iPhone 12 series. iPhone 11 series. iPhone SE (2nd generation)
Skipping phone updates leaves your device vulnerable to security threats, causes app compatibility issues, and reduces performance over time. Your phone becomes increasingly unstable, slower, and less secure without regular software updates.
The iPhone 11, released in 2019, is expected to receive major iOS updates until late 2025 or 2026 (around iOS 26/27), with security updates continuing for at least another year or two after, possibly until 2027-2028, following Apple's typical 5-7 year support cycle for hardware and security. It currently supports iOS 26 as of late 2025, but is predicted to be at the end of its major OS upgrade path soon.
iPhone battery's maximum capacity
It starts out at 100% (or just under), and as the battery ages, capacity decreases, which means you get fewer hours between charges. If the number you see under Maximum Capacity is more than 80%, you have a healthy battery, according to Apple.
For example, streaming videos or music, making calls, and gaming on the go typically cause your battery to drain much more quickly. Other culprits of battery draining include active applications in the background or constantly updating, such as real-time weather apps.
It is absolutely abnormal to lose 1% in 3 minutes of usage.