Free Apple Watch Series 2 or Series 3 screen replacement
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https://support.apple.com/screen-replacement-program-apple-watch-series-2-3
Screen Replacement Program for Aluminum Models of Apple Watch Series 2 and Series 3
Apple has determined that, under very rare circumstances, a crack may form along the rounded edge of the screen in aluminum models of an Apple Watch Series 2 or Series 3. The crack may begin on one side and then may continue around the screen as shown in the images below.