Maxcom MM428 User Manual page 11

SIM Card
downwards so that the card contacts will
touch the phone contacts, close the pin
and position it back to the LOCK position
(downwards).

As on option, install a MicroSD Memory
Card. To do it, slide the pin to the OPEN
position (to the right), and next lift the pin.
Insert MicroSD Card so its contact pins
touch the telephone contacts, and slide the
pin back, towards the LOCK position (to the
left).
with the
SD Memory Card
Slot
SIM2 Card
SIM1 Card
notch facing
11