Petfon is kind of like an iPhone, when our customer registers on it, it would have its own ID which protects it from being used by anyone else even if it's stolen.
Only the owner can unbind it from his own account. If you want to sell/give it to a second person, you have to unbind it from your account at first,otherwise no one else could use it.
If you purchased a brand new Petfon, but still have such a problem. It might because our inspecition equipments failed to unbind it during inspection procedure. Please totally don't worry about it, this is a normal situation. Please try binding it again 24 hours later