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Penguin PG15 GSM Modem status

I have installed a GSM Modem card with a SIM, and I can read the status of the Modem Interface using the GetInterfaceStatus() function. This shows the status as INIT. What can cause this? There is presently no aerial, but I have ordered one for site work.

The User manual mentions that the GSM modem returns a signal strength number. How can this be obtained?
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