How do I use my iPhone in China to make calls, and perhaps with data?

Has invited:
Assuming your iPhone is unlocked (google for software to do so), you can get a prepaid SIM card at the airport.  Phone service in general is dirt cheap in China, (I think unlimited plans run something like US$15 a month), and I'm relatively sure you can get prepaid SIM cards with data plans.

If you don't need a data plan, you can get a regular voice card with something on the order of 100RMB of usage preloaded on it for 90RMB (~US$15).  You'll need to press a hard bargain (especially if you're not Chinese), and go with someone who speaks Mandarin, or expect to be seriously ripped off.

Also, China Mobile has better coverage overall, but Unicom tends to have improved coverage the further.

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