For some reason I did insert another SIM-card into my phone and removed it later.
Suddenly I find all the contacts of this SIM-card in my phone book.
Otherwise the contacts are not really there... They do not sync with myPhoneExplorer, if I want to edit one of these contact, I'll be asked where to add this contact.
So how can I get rid of these contacts? And how can I avoid that contacts are copied without my agreement when I insert other SIM-cards?