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I am interested in buying a Delta Dore alarm and wanted to know which sim card and which operator was needed for the installation of the GSM dialer. My current operator is FREE but according to them, the FREE sim card is not compatible.

In the case of a line in partial unbundling, the transmitter works without any problem if it is connected directly to the line via an ADSL filter, without going through the Box.
If unbundling is complete, I think you could use a GSM dialer that is independent of the fixed line.
I am not a specialist in telephony and advise you to also ask your question on our forum DIY

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