HTC One X10 - Manual (Page 17)

Also, if you want to use a protective case, make sure to buy a case that's designed for HTC One X10
and that doesn't block the tray.
nano SIM card
On HTC One X10, use a standard nano SIM card. Inserting a modified card that is thicker than the
standard nano SIM card may cause the card to not fit properly or damage the card slot.
Inserting the nano SIM card
1. Hold the phone face up.
2. Insert the tip of the tray eject tool that came with your phone—or a small bent paperclip—
into the tray eject hole.
3. Push the tip all the way into the hole until the tray ejects, and then pull the tray out.
17 Unboxing