HTC One X10 - Manual (Page 18)

4. Do the following to place your nano SIM card into the tray:
§ Single SIM model: With your nano SIM card's gold contacts facing down, place the card
into the SIM holder of the tray. Make sure to align the cutoff corner to the notch on the
holder.
Place your microSD ™ card into the SD holder of the tray. See Inserting the microSD
card on page 20.
§ Dual SIM model: With the gold contacts facing down, place your nano SIM cards into
the SIM 1 and SIM 2 holders of the tray. Make sure to align the cutoff corners to the
notches on the holders.
§ By default, SIM 1 will connect to the 4G LTE/3G network, and SIM 2 will connect to 3G/2G. To
find out how to set the preferred card for connecting to 4G LTE, see
Managing your nano SIM
cards with Dual network manager on page 23.
§ SIM 2 and SD are labeled on the same holder in the tray. Either place your second nano SIM
card or a microSD card into this holder. Both cards can’t be inserted at the same time.
18 Unboxing