Sony SGPT11 Series Help Manual page 27

5. Place a SIM card on the SIM tray so that the cutout of the SIM card fits that of the SIM tray.
Note
Make sure there are no protrusions on the cutting surface after detaching the SIM card from its plastic
package. Otherwise, the SIM card may not fit in the SIM tray.
6. Insert the SIM tray.
Note
Make sure not to insert the SIM tray in the reverse direction.
To remove a SIM card
1. Follow the procedures up to step 5 of "To insert a SIM card," then remove the SIM card from the tray.
The procedures after this step are the same as from step 6 of "To insert a SIM card."