Apple’s iOS 13.4.1 update could have a tremendous impact on your iPhone 6s or iPhone 6s Plus’ performance.

iOS 13.4.1 has replaced iOS 13.4 as the most up-to-date version of iOS 13 and most iPhone 6s and iPhone 6s Plus users should download the new firmware today or at some point in the near future.
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https://www.gottabemobile.com/8-things-to-know-about-the-iphone-6s-ios-13-update/