NGM P550 Guide Rapide page 42

Be careful if you intend to use a micro SIM card with an adapter on the SIM slot, as it might
get stuck inside the slot thus impeding the correct insertion and removal of the
SIM card. For these reasons, the use of card adapters is strongly discouraged.
Inserting the memory card: to better manage all the functions of NGM You Color P550,
you are recommended to use a micro-SD card: insert it into the back side of the phone.
After turning off the phone, remove the back cover and the battery; insert the micro-SD
into the slot on the upper right corner as shown in the figure and push it inside its slot.
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