Maxcom MM918 STRONG DualSIM User Manual page 12

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As on option, install a MicroSD Memory Card.
To do it, slide the pin to the LEFT, and next
lift the pin. Insert MicroSD Card so its contact
pins touch the telephone contacts, and slide
the pin to the RIGHT.
Be careful while using the memory card particularly while
installing and uninstalling the card. Some memory cards
shall be formatted on the computer prior to an initial use.
Make backup copies of data stored on the cards used in
other devices, if you use SD cards! Misuse or other
factors might cause damage or loss of data stored on the
cards.
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Insert the battery with the contact pins +/-
facing downwards
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