I bought a china mobile SIM card a couple of visits back -- and now several contacts in beijing have this number for whenever I'm here, so I don't want to get a new SIM/number.

However, now that I have a smart phone, would appreciate using the features if possible. Can I get a sort of data top-up on my existing SIM card, and if so, how would I go about doing this?

Any help much appreciated.

tb