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card
The SIM card
error
is not in
position.
The metal
face of the
SIM card is
polluted.
Signals are
obstructed.
For instance,
radio waves
Poor received
cannot be
signal quality
effectively
transmitted
nearby a high
building or in
a basement.
Check the SIM card
Clean the SIM card with a clean cloth
Move to a place where signals can be effectively transmitted
-33-
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