
Apple today released the first public beta of iOS 11 for eligible iPhone, iPad, and iPod touch models, allowing users who aren't signed up for the Apple Developer Program to test the software update ahead of its official release in the fall.

iOS 11 is pre-release software, so installing the beta on a secondary device is highly recommended. Due to bugs and other potential issues, installing the iOS 11 beta on an iPhone that you use everyday is generally not a good idea.
Installing the iOS 11 public beta is a relatively simple task that, in most cases, shouldn't take longer than 15 or 20 minutes from start to finish. Here's the step-by-step instructions for an iPhone, which extend to the iPad and iPod touch.
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Article Link: How to Install iOS 11 Public Beta on iPhone, iPad, and iPod Touch