Motorola A1000 Start Here Manual page 21

Caution: Do not bend or scratch your USIM card. Avoid
exposing your USIM to static electricity, water, or dirt.
Action
1 Push down the
release latch,
and slide the
back cover down
to remove it.
2 Slide the USIM
card door toward
the top, then lift
upward to open.
3 Insert the USIM
card into the tray
(gold plated
contacts facing
down, and notch
to the right).
18
Release Latch
USIM
Card
Notch