AT&T U102AA User Manual page 11

To insert Nano SIM or microSD card, push the Nano SIM or microSD card into the
corresponding card slot with the gold-connectors facing down. To remove the SIM or
microSD card, push down on the plastic clip and pull the SIM or microSD card out.
Your phone only supports Nano SIM card. Do not attempt to insert Mini or Micro
SIM card sizes or you may damage your phone.
Charging battery
7