What's in the newest iOS update

Apple releases a major iOS update once a year, usually in September, with smaller security updates arriving throughout the year. The current version as of early 2024 is iOS 17, with periodic updates like 17.2, 17.3 adding fixes and features. Each update includes security patches that close vulnerabilities — holes in the system that hackers can exploit — plus changes to how your phone handles your data and what apps can see.

You can find your current iOS version by opening Settings, tapping General, then About. The version number appears next to "Software Version". If you see a number lower than 17, your phone is running older code with known security gaps still unfixed.

The security patches in each update matter more than the new features. A patch might fix a flaw that lets someone access your photos without permission, or one that lets malware run in the background. These fixes don't make headlines, but they're why security researchers recommend updating as soon as the update is available.

Key Takeaways

  • iOS updates arrive monthly or more often, and each one patches security vulnerabilities that could let someone access your data or run malware on your phone.
  • You can see your current iOS version in Settings > General > About, and you should update within a week of Apple releasing a new version.
  • Major updates (like iOS 17) add new features and privacy controls, while smaller updates (like 17.2.1) focus mainly on closing security gaps.
  • Delaying an update leaves your phone running code with known flaws that attackers already know how to exploit.

How to check for and install updates

Go to Settings, then General, then Software Update. Your phone will check whether a new version is available. If one is, you'll see the version number and the option to "read and Install" or "Install Tonight". Tap whichever you prefer.

If you choose "Install Tonight", your phone will update automatically after you plug it in and lock the screen. If you choose "read and Install", the update begins right away and your phone will restart during the process — you'll see the Apple logo and a progress bar. Don't unplug it or force it off during this time.

Updates usually take 15 to 30 minutes total. You'll lose access to your phone during the restart, so don't schedule an update right before you need to leave the house or take a call. Plugging in your phone first ensures the battery won't die mid-update.

What changes in security and privacy with each update

Major updates like iOS 17 often add new privacy controls — for example, iOS 17 added the ability to lock individual apps behind Face ID or Touch ID, so someone who picks up your phone can't open Messages or Photos without your fingerprint. Smaller updates focus on closing specific security holes without adding visible features.

Apple publishes a security document for each update listing which vulnerabilities were patched. These documents are technical and long, but they show that updates aren't just marketing — they're fixing real flaws. A patch might say something like "an app could read your location without permission" or "a website could crash your phone and run code". Once Apple patches it, older iPhones running older iOS versions remain vulnerable to that same flaw.

You won't see most of these fixes in daily use. Your phone won't feel faster or look different. But the gaps that let attackers in are smaller.

Why delaying updates puts your data at risk

Once Apple releases a security patch, security researchers and hackers both know what the flaw was. They can work backward from the patch to understand the vulnerability, then exploit it on phones still running the old version. This window — between when Apple patches and when you update — is when your phone is most at risk.

Phones running iOS versions more than two or three updates behind are common targets. A hacker might send you a text message with a link that exploits a known flaw, or a website might try to exploit the flaw when you visit. Your phone is more likely to be compromised the longer you wait.

If you delay updates because you're worried about bugs in new versions, that's understandable — but the security risk of staying behind outweighs the risk of a new bug. Apple tests updates extensively before release, and any serious problems are usually caught within the first week. Waiting a week after release is reasonable; waiting months is not.

What to do if an update fails or your phone won't update

If your phone says "Unable to Update" or the update keeps failing, try these steps in order: first, make sure you're connected to Wi-Fi and plugged in. Second, restart your phone by holding the power button and sliding to power off, then turning it back on. Third, go back to Settings > General > Software Update and try again.

If it still fails, your phone may not have enough storage space. Go to Settings > General > iPhone Storage and look at the number at the top. If you have less than 5 GB free, delete photos, videos, or apps you don't need, then try updating again.

If the update still won't work after clearing space and restarting, you may need to use a computer. Connect your iPhone to a Mac or Windows PC with iTunes or Finder installed, open iTunes or Finder, select your phone, and choose "Update" or "Restore". This process is more involved but usually resolves stuck updates. If you're not comfortable doing this, an Apple Store can help.

Automatic updates and why you might want them on

You can turn on automatic updates so your phone downloads and installs new versions without you having to remember. Go to Settings > General > Software Update > Automatic Updates, then turn on "read iOS Updates" and "Install iOS Updates". Your phone will read updates when connected to Wi-Fi and plugged in, then install them overnight.

The trade-off is that you lose control over exactly when the update happens. Your phone might restart in the middle of the night, or you might wake up to find it's already updated. But you won't accidentally stay on an old version because you forgot to update, and you won't have to think about security patches at all.

If you prefer to stay in control and update manually, that's fine — just commit to checking for updates at least once a month. The risk of staying behind for months is real; the risk of being a few weeks behind is much smaller.

Understanding what data Apple collects during updates

When your phone updates, Apple receives some information: your device model, your current iOS version, and whether the update succeeded or failed. Apple uses this to know which devices are still running old versions and which updates are causing problems. This data is tied to your device, not directly to your name or Apple ID, though Apple can connect them if needed.

You can't opt out of sending this information — it's part of how the update process works. But Apple's privacy policy states this data is used only for improving updates and security, not for advertising or sold to third parties. If you're concerned about what Apple collects, you can read their full privacy policy on apple.com, though the update process itself is not optional if you want security patches.

Frequently Asked Questions

Will updating my iPhone delete my photos or data?

No. Updates preserve everything on your phone — your photos, messages, apps, and settings stay exactly as they are. The update only changes the operating system code running underneath. If you're worried, you can back up to iCloud before updating by going to Settings > [Your Name] > iCloud > iCloud Backup and tapping "Back Up Now", but it's not necessary.

Can I go back to an older iOS version if I don't like the new one?

Apple doesn't allow downgrading to older versions once you've updated. You're locked into the new version. This is intentional — it prevents people from going back to versions with known security flaws. If a major update causes serious problems, contact Apple Support, but you can't straightforward revert.

Does updating slow down my iPhone?

Updates sometimes feel slower when ready after installation because your phone is indexing files and reorganizing data in the background. This usually finishes within a few hours. Older iPhones may feel slower on newer iOS versions because the new code is more demanding, but security patches don't typically slow you down.

What if I'm traveling and can't update right away?

If you're traveling without reliable Wi-Fi, you can wait until you're home. A few weeks of delay is much lower risk than months. Just make sure you update within a month of the release date. If you're worried about security while traveling, avoid connecting to public Wi-Fi networks and use a VPN if you must — but updating when you get home is the real fix.

Why does Apple release updates so often?

Apple finds new security flaws constantly, either through its own testing or from security researchers who report them. Each flaw gets patched as soon as possible. Frequent updates mean frequent patches, which means your phone is protected against the latest known threats. The alternative — waiting months between updates — would leave phones vulnerable much longer.