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If your mac/device develops an issue and you need to get it looked at, you're not going to be sitting at an Applestore when the issue happens, so you simply phone or go online and book an appointment. No excuse for this to be of an inconvenience to anyone really, and it should mean you don't have to wait around to speak to someone if they know you're coming.

I know at least in the US if you call the store the automated system directs you to go online to make an appointment. Can you call AppleCare?
 
It also has to do with scalpers in China booking all of the very few appointments and then selling them for a profit upwards of $2000 a week.

Quite agree, I'm in Hong Kong and we see a big problem in booking Genius Bar. And you can easily find 'booking slot' in some of the mainland China websites for trade.
 
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