The iPhone 7 iOS 11.4 update is a large milestone release and it could have a significant impact on your device’s performance.
Apple’s latest iOS 11 update is much larger than iOS 11.3.1 and comes with important bug fixes, security patches, and a handful of new features.
While iOS 11.4’s intentions are good, the update is causing problems for some iPhone 7 and iPhone 7 Plus owners. iPhone 7 users who adopted the software update are complaining about UI lag, battery drain, and issues with various first and third-party applications.
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https://www.gottabemobile.com/10-things-to-know-about-the-iphone-7-ios-11-update/
