Samsung SGH-T809OKATMB - Manual (Page 11)

Section 1: Getting Started 7
Activating Your Phone
Section 1
3. Remove the battery. Grasp the bottom of the battery (1)
and lift up. Pull the battery out and away (2).
4. Slide the SIM card into the SIM card socket so that the
card locks into place. Make sure the gold contacts of the
card face into the phone.
Note: When you need to remove the SIM card, slide it, as shown, and take
it out of the socket.