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Advantages and disadvantages of mobile ec20 module
As follows:
The advantage is that you can make phone calls, send text messages and surf the Internet through this module.
Disadvantages This module is full netcom, which means that telecom cards, 2g, 3g and 4g can all be supported.
It is much better than sim800c which only supports Unicom and mobile.
As for the external circuit, since the engineer has already done it for us, we won't do research and analysis here.
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