AppleCare+ on second hand devices
my iphone is eligible for Apple care +
can I buy it, as I bought the phone as second hand
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Yes. If you are offered Apple Care+ in Settings in your iPhone, you can still set it up. In most countries you can set up Apple Care+ up to 60 days after purchase (purchased the first time), elsewhere it is 30 days. In China you have a maximum of 7 days.
You can find more information here:
Buy an AppleCare plan - Apple Support