I will be going to Hong Kong and China for about 2 months. I'll be
in Wuhan for 1 week for a holiday. I would like to know if there
are any Prepaid 3G Data Plan SIM Cards available for sale that
works in both Hong Kong and China (Maybe China Unicom?). Using an
iPhone 4, so I guess I would have to cut the card. 
Please reply if anyone knows anything about Prepaid Data SIMs and
please tell me about the price too. And would voice calls and SMSes
work?