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I'm testing use of a 3g dongle which is pay as go (in the UK). I'm sending messages to Thingspeak (via Python on Pi) but the credit allowance decrease indicates several megabytes have been used. Even if one message is 1,000 bytes then after 1,000 messages like this I'd expect to lose 1 megabyte of credit but instead it's 10 MB (I'm sending https://api.thingspeak.com/update?api_key=xxxxxxxxxxxxx&field3=12345 ) Has anyone experience of data logging over a mobile data dongle and how much it should cost ?