My LU200 unit does not connect to the Internet. What is the problem?

• There is no cellular reception

• There are no SIM cards inserted in the LU200 unit

 • SIM cards were inserted only after the unit was turned on

 • The SIM cards are not activated or do not support the data plan

• Modems are disabled

• SIM PIN is not disabled

• The APN is not configured correctly on the modems