Originally Posted by
plunet
A previous good value trick was to buy traveller SIMs off eBay from HK for use in China but I think with the requirement more recently to have proof of ID to get a HK SIM card this opportunity has dried up as a mail order service.
My first experience with this was smoother than I expected. Any CSL-based SIM, for instance, allows you to register online from anywhere by uploading a photo of your passport. It's significantly easier than the mainland system.