The iOS 12.3.1 update could have a significant impact on your device’s performance. Some you should install the update right now, but others might want to wait a few hours, a few days, or, in some cases, a few more weeks before making the move.

iOS 12.3.1 is now available for iPhone, iPad, and iPod touch models and Apple’s latest update comes with a short list of important bug fixes for your device.
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https://www.gottabemobile.com/4-reasons-not-to-install-ios-12-9-reasons-you-should/