Yes, in fact we met the master franchise holders last week at a conference; they are expanding rapidly. On the whole, the quality is notch or two down from the US standard, but definitely works in a pinch. There is also at least one in Beijing Airport, which has dramatically improved my travel experience.

Your phone should work in China if you get unlocked, but you still might want to consider buying one locally if you care about Chinese language support.

As for the hotel, I suggest you try to figure out its location before making a final decision because Qingdao is a big place.

Based on those fares, it sounds like you might be trying to go to Guangzhou during the fair. If so, be prepared to spend a lot more money than you otherwise would.