This is an old post, but for future people:
The shield may have not been switched on — it has its own power button, which is right next to the SIM card. It's tiny, but it's there.
Frank
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Visit Stack ExchangeThis is an old post, but for future people:
The shield may have not been switched on — it has its own power button, which is right next to the SIM card. It's tiny, but it's there.