This is just a quick tip that might be of interest. If you want to refill your mobile phone credit with a simple SMS, just follow those steps:

• Buy a China Mobile card (this kind of paper) in any convenience store (50 or 100 RMB);
• Find the number starting with "09" at the bottom;
• Send a SMS to China Mobile with Cz followed by the former number (in this case Cz091487305783274341).

Please note that you have to do this before your credit expires, or you’re not going to be able to send the SMS at all.