| iPhone model | Chip | Year | All features? |
|---|
| iPhone 18 Pro / Pro Max | A20 Pro | 2026 | Yes |
| iPhone 18 / 18 Plus | A20 | 2026 | Yes |
| iPhone Air | A20 | 2026 | Yes |
| iPhone 17 Pro / Pro Max | A19 Pro | 2025 | Yes |
| iPhone 17 / 17 Air | A19 | 2025 | Yes |
| iPhone 16 Pro / Pro Max | A18 Pro | 2024 | Yes |
| iPhone 16 / 16 Plus | A18 | 2024 | Yes |
| iPhone 15 Pro / Pro Max | A17 Pro | 2023 | Yes |
Source: Apple Newsroom (September 9, 2026).
Standard iOS 27 features (no Apple Intelligence 2.0)
Devices that get iOS 27 but without Apple Intelligence 2.0 (no GPT-5, no LLM Siri, no on-device AI image generation):
| iPhone model | Chip | Year | iOS 27 features? |
|---|
| iPhone 15 / 15 Plus | A16 | 2023 | Yes (no Apple Intelligence) |
| iPhone 14 Pro / Pro Max | A16 | 2022 | Yes (no Apple Intelligence) |
| iPhone 14 / 14 Plus | A15 | 2022 | Yes (no Apple Intelligence) |
| iPhone 13 and earlier | A14 and earlier | 2021 and earlier | Not supported |
Source: Apple Newsroom (September 9, 2026).
Installation step-by-step
Pre-installation checklist
- Backup your iPhone:
- iCloud backup: Settings > [Your Name] > iCloud > iCloud Backup > Back Up Now.
- Computer backup (iTunes/Finder): Connect iPhone to computer, open iTunes/Finder, click 'Back Up Now'.
- Encrypted backup recommended to save Health data, passwords, Wi-Fi settings.
- Check storage: Settings > General > iPhone Storage. iOS 27 requires 7-8 GB free.
- Charge battery: 50%+ or plugged in.
- Connect to Wi-Fi: required for download (5-6 GB file).
Installation
- Go to Settings > General > Software Update.
- Wait for iOS 27 to appear (may take up to 24 hours after release).
- Tap 'Download and Install'.
- Enter your passcode.
- Agree to terms and conditions.
- Wait for download (~30-60 minutes depending on connection).
- Tap 'Install Now' when prompted.
- iPhone will restart and install (~20-45 minutes).
- Set up Apple Intelligence 2.0 when prompted (compatible devices).
- Re-enable any disabled features (e.g., Background App Refresh, Location Services).
Troubleshooting
- 'iOS 27 not appearing': device may be incompatible; check Apple support list.
- Download stuck: restart iPhone, check Wi-Fi, try different network.
- Not enough storage: remove apps, photos, or videos to free space.
- Verification failed: try again, restart, or use iTunes/Finder to install.
- Activation issues: ensure SIM is inserted, carrier settings updated.
- Battery drain after install: normal for 1-2 days as iOS reindexes; reverts to normal.
App compatibility
Most apps work immediately with iOS 27; some require updates from developers:
- Auto-updating apps: install on first launch or via App Store updates.
- Apps requiring iOS 27 APIs: updated apps that use new APIs (Apple Intelligence, Live Activities 3.0, RCS).
- Legacy apps (not updated): may have minor compatibility issues but generally work.
- Enterprise apps (managed devices): IT may need to test before deployment.
- Game apps: typically require updates for new Metal API features.
Check the App Store for available updates before installing iOS 27 if you depend on specific apps (Apple developer documentation, 2026).
Privacy and security in iOS 27
iOS 27 includes privacy and security enhancements:
- Private Cloud Compute (PCC): AI queries requiring cloud processing use Apple Silicon servers with cryptographic privacy guarantees; no data retention.
- App Privacy Manifest: required for all App Store apps declaring data collection.
- Mail Privacy Protection: enhanced to block more email tracking pixels.
- Safari Privacy: advanced fingerprinting protection; link tracking protection.
- Communication Safety: expanded to Messages, FaceTime, AirDrop, and Photos.
- Lockdown Mode: expanded protections for high-risk users.
- Stolen Device Protection: enhanced iPhone security when device is stolen.
- Passkey support: expanded to more apps and websites.
Apple's on-device AI and Private Cloud Compute are the most privacy-preserving AI architecture among major AI providers (Apple, 2026).
FAQ
Will iOS 27 slow down my iPhone?
iOS 27 is optimized for iPhone 15 Pro and later; performance on these devices is excellent. iPhone 14 series will see some performance reduction compared to iOS 26 but should remain acceptable. iPhone 13 and earlier are not supported. If you have an iPhone 14 and notice significant slowdowns, consider staying on iOS 26 (latest security patches) for now. Battery life may decrease 5-10% for the first 1-2 days after install as iOS reindexes, then reverts to normal (Apple Support, 2026).
Should I get iPhone 18 or iPhone 17 with iOS 27?
iPhone 18 (released September 18, 2026) has the A20 chip, better camera system, and exclusive features. iPhone 17 (released September 2025) has the A19 chip and runs iOS 27 with full features. For most users, iPhone 17 is sufficient and less expensive. iPhone 18 is for users who want the latest camera, processing power, and exclusive new features. Consider iPhone 18 if: you're a power user, want the best camera, or need the latest performance. iPhone 17 if: you want full iOS 27 features at lower cost, current iPhone 14 or earlier (Apple, 2026).
Photo: CGBR, CC BY, via Wikimedia Commons (https://upload.wikimedia.org/wikipedia/commons/f/f7/IPhone_13_iPhone_4s_backside_01.jpg?utm_source=commons.wikimedia.org&utm_campaign=imageinfo&utm_content=original)
Fazlur Rahman
