One never finishes learning. A lesson I learned during the last networking-event I visited here in China: Never give your business card with your mobile phone number to the represantative of a business-club. In China, you will receive lots of spam SMS with invitations to parties or events. And there advertisment text is usually quite long, so you always will receive 5 messages at the time.

I guess, I have to print special business cards without my mobile phone number for this kind of contacts.