I want to buy my IPad in Holland (3G + WiFi) and want to use it in China with a Chinese sim card! Can anyone tell if thats possible (size of the sim cards are different!).
It's not a problem. microSIMs are widely available in China or you can simply purchase a SIM cutter to cut the excess plastic off a regular SIM to make it microSIM size. These cutters are widely available - for example, Amazon.