Click each step to see the action, or click the picture or use the arrow keys. 1  1. Press and hold the Power/Lock Key. 2  2. Tap Power Off. 3  3. Tap OK.  4. Remove the battery 1  cover. 5. Insert the SIM Card into the SIM Card slot.  6. Replace the battery 1  cover. 7. Press and hold the Power/Lock Key to turn the phone back  on.