Samsung GT-B3800 - Manual (Page 14)

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REMOVING THE 4G LTE SIM CARD
To remove the SIM card, carefully slide the SIM card •
out of the SIM card socket.
RESETTING YOUR DEVICE
Resetting your device restores all factory defaults. You
may need to reset your device if you cannot connect
device(s) to your Samsung 4G LTE Mobile Hotspot.
Remove the battery cover, press and hold the • Reset/
WPS key for 10 seconds on the left side of the device
to return device to default setting.