Re: how come i dont have any contacts if im using the same sim ca
Did you come from an Android phone before? If so did you store your contacts with Google? If you did they should automatically sync with your phone.
If you came from another OS you will need to figure out a way to get them onto your SIM (hopefully you have your old phone still) and then import them onto the SGSII.
You might also need to switch views. In your contacts app press menu, more, Display Options. Hope that helps (I haven't had this problem before).