Maxcom MM820 Plus, User Manual, Page: 32 / 77

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Most of the networks, but not all of them, accept
emergency numbers (112, 999, etc.) without an active
or inserted SIM card. Contact the operator for further
information.
8.1 SOS button
To initiate emergency calls press and hold SOS key for 3
seconds. The mobile will automatically send an alarm
SMS to numbers from the emergency contact list, and then
it will start calling undefined numbers. Unless the call is
answered within 60 seconds, the telephone will select
another number. The process repeats 3 times until the call
is answered. Press the red headphone to call another
person from the emergency contacts during the SOS
mode. Press and hold SOS key to stop the SOS procedure.
Automatic calls to number 112 are not allowed. Do not
write the number on the list. Remember that a service is
activated as turned on in the MENU.