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Hi Cedric, Grasshopper (and the other CMWX1ZZABZ products) is designed to work at European frequencies. Typically, the Grasshopper would be used with a LoRaWAN gateway. I have both the Multitech AP (which I would recommend) and the Things Network gateways. Both work well enough although the TTN gateway is having some problems at the moment. The Multitech AP is ~$300. The Things Network is a network of privately owned gateways. In the major cities in Europe the coverage is sufficient that you don;t need your own gateway, some TTN agateway will capture your data. Look up the local TTN members in your area to see what the coverage is. I am sure in Paris you wouldn't need a gateway. The gateway receives the LoRaWAN data from the Grasshopper, and then forward the data packets to a LoRa server. I use the SEMTECH server but there are many available at no cost. Then the LoRa server pushes the data to whatever back end you want; I use myDevices and CayenneLPP. The things network has a lot of tutorial information so look there, they also have a forum where you can ask more detailed questions. You shouldn;t need a mobile network subscription. Kris

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