There are several things you can do to improve your iPhone's battery life. Considering the recent issues many 3GS owners are experiencing with firmware updates 3.1 and later, these tips are important to those who don't want to charge their iPhone twice a day. Turn off 3G when you don't need it for data. This actually has the added benefit of improving voice call quality for some users. Turn off Wi-Fi when you don't need it. Reduce the brightness of your iPhone screen. Use the slider to reduce the brightness as low as you can. I find the slider centered under the "i" in the word Brightness as a good compromise. Turn off the GPS when you don't need it. Turn off push notifications. They don't always work, anyway. Turn off push Mail. Adjust your Mail fetch frequency. Either choose Manually or reduce your Fetch frequency to Hourly (unless you need more frequent mail action), then touch Advanced. Under Advanced you can decide for each mail account if you'd like to fetch or update manually. Make sure the Auto-Lock is set to one minute. Turn off the iPod equalizer. Turn off Bluetooth when not in use.
This process could take a few minutes and it will force your device to forget your connections (and passwords) but it might resolve your battery life issues. It won’t delete any files. If that doesn’t work, you could try downgrading your iPhone 7 or iPhone 7 Plus to the previous versions of iOS if a downgrade is available. For more on the downgrade process, take a look at our walkthrough. If none of that works, you can try restoring from a backup or wiping your iPhone 7/iPhone 7 Plus completely. This should only be used as a last resort because it’s extremely time consuming. Plug in and backup to the computer or to iCloud. In iTunes, Click Restore. Follow the prompts and the iPhone will reinstall iOS from scratch. When it completes click Restore from Backup to put your information back on the iPhone or Choose to set up as a new iPhone.
Again, you should only do this if nothing else works. If you don’t want to restore or perform a factory reset, you can also make an appointment to go see an Apple Genius at the Apple Store. Geniuses will be able to run some diagnostics on your phone and they could help you figure out the problem. If you’re under warranty, and you are right now, you might be able to get another iPhone 7 or iPhone 7 Plus for free. Apple's iOS 11.2.5 update comes with 10 security patches including one for the malicious chaiOS link exploit. If you're running iOS 11.2.2 or below and receive a certain GitHub link through your Messages app, your iPhone or iPad can lockup or respring. The Messages app will also become unusable. If you're on iOS 11.2.1, your iOS 11.2.5 update includes security improvements to Safari and WebKit to mitigate the effects of Spectre.
If you're running an older version of iOS, your iOS 11.2.5 update will come with a lot more. Apple's iOS 11.2 update fixed several problems, but it also brought problems of its own including a potentially nasty zero-day iOS HomeKit vulnerability. The vulnerability, discovered by Tian Zhang, allowed for unauthorized control of HomeKit accessories including garage door openers and smart locks. If you skipped iOS 11.2, you'll get a few more patches with your iOS 11.2.5 update. Apple's iOS 11.2 update delivered 11 patches including one for Mail and one for Wi-Fi. If you skipped iOS 11.1.2, iOS 11.1.1, and iOS 11.1, you'll get additional patches with your iOS 11.2.5 update. The iOS 11.1 update delivered eight security patches including a fix for a serious Wi-Fi vulnerability called KRACK or Key Reinstallation Attack. KRACK is an exploit that targets the common WPA2 encryption protocol. If you're just now making to move from iOS 10 (or whatever you're on) to iOS 11, your iOS 11.2.5 update will come with additional security features.
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