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Definitely related to poor antenna matching. This is complex stuff and should preferably be fixed by changing antenna matching (e.g. by a matching circuit or simply trying out a different antenna). I have also seen that it helps to wait until you get the unsolicited modem response "Call Ready". Until you get this message, it can disturb the modem to receive ...


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Communicating and Encryption are to completely separate things. How you communicate (with what device) has no relevance to encryption. True, there are devices that can themselves encrypt data, but they tend to be higher-end or geared towards a specific purpose (such as WiFi). What you send is just data. What that data consists of is entirely up to you. If ...


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