Thanks for your reply.
I remember the account name (email) I used to log into iPhone app. I just email u my iPhone address in case.
According to what u told me, I can't find "the name of the iPhone", only find this, u can see in the picture i uploaded.
And I tried to click "deactivate eye-fi card" button, and it showed "successful", but I still can't log into, "Add device error,....already been registered"
I also sent an email to email@example.com