Tip: Samsung Epix — Changing SIM Cards
Here's how you do it:
Press the button just below the camera lens with your thumb and then use that thumb to push the back down. It should pop up. Then, just slide it off and remove it. Once the back is open, grip the battery from its sides nearest the bottom edge of the phone. Pull it up and out. Then, gently slide in the SIM, following the orientation in the little picture. Replace battery by placing the front-facing side in and the lowering the back. Snap on the back cover.
When removing the SIM, simply place one finger on it and gently slide it out. It gives readily.