Whether you’re cleaning your Apple Watch band or upgrading to a new one, removing the band from the watch is a simple process that should only take a few seconds.
Regardless of the series of Apple Watch you have, the process for removing the band is the same. Note, according to Apple, that “bands for 38mm and 40mm cases are compatible with each other, and bands for 42mm and 44mm cases are compatible with each other.” The sizes for your Apple Watch case and bands can be found on the back of your bands, but be warned: The text is really small.
Here are the steps to remove or change the band from your Apple Watch. Read more…
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Source : How to change or remove the band on your Apple Watch