iPhone only: an Apple Watch doesn’t pair with an Android phone.
Before you pay: the seller unpairs the watch from their iPhone in front of you.
What to check before you pay
Five minutes that save you a headache:
Unpaired from the seller’s iPhone, in front of you: Apple Watch app › All Watches › Info › Unpair Apple Watch. Otherwise it stays linked to their Apple Account and won’t pair with your iPhone.
Battery: on the watch, Settings › Battery › Battery Health.
The touchscreen, the Digital Crown, the side button and the sensors on the back.
Where to buy it
There’s no Apple Watch Series 9 for sale on Damjitech right now.