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Solutions to Frequently Asked Questions
Module can not call for testing
In this problem, please see:
1, whether the antenna connection is good, can through the instructions AT + CSQ examination. The signal is not strong, will lead to dial-up failure.
2, the SIM card whether still have the balance, is good the SIM card. In the development board with inspiration in the SIM card, easy to burn out the SIM card. If Carrie have no money, is playing out the phone. Usually we can will card dial the out, on the phone call, to test the quality of the SIM card.
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