Apple Watch
My watch isn't paired to my phone, my watch is locked an I cant reset it.
Apple Watch Series 3, watchOS 4
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Connect your watch to its charging cable, with power connected.
Press and hold the side button until you see the Power Off slider.
Press firmly on Power Off (do not try to slide it - just press down more firmly than a normal tap) and then tap on Erase all content and settings.
Re-pair your watch using the Watch app on your iPhone, choosing to Restore from Backup if offered the option.