Connectivity error have different causes, as specified below:
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The SIM you're using is not recognized because the modem is network locked. You will have to unlock the modem to accept SIM cards from different carriers.
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The service is limited since you are in an area with low or missing signal.
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You don't have enough credit left or the service is suspended.
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The modem is not configured properly with a number to call to connect to the Internet.
For all these probable causes, contact the carrier of the SIM card to see if there is something wrong.
