UPT is turned on but the screen is blank OR UPT is offline from the network.

This error may be due to any of the following reasons:

SIM card is not installed
SIM card is inactive
SIM card is invalid
SIM card not installed properly
SIM card is installed in the lower slot instead of upper left slot
No antenna/wrong antenna attached
Antenna connector is not secured properly (do not finger tight the antenna connector)
Antenna not mounted vertically in open space
APN is not set to match the SIM card cellular service
UPT is not restarted after inserting a new SIM card.

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