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The 'number' property in GSM settings is a legacy thing that comes from when ModemManager used user-provided numbers, if any, to connect 3GPP modems. Since ModemManager 1.0, this property is completely unused for 3GPP modems, and so it doesn't make sense to use it in the NetworkManager settings. Ofono does not use it either. For AT+PPP-based 3GPP modems, the 'number' to call to establish the data connection is decided by ModemManager itself, e.g. for standard GSM/UMTS/LTE modems it will connect a given predefined PDP context, and for other modems like Iridium it will have the number to call hardcoded in the plugin itself. https://github.com/NetworkManager/NetworkManager/pull/261
6ed21e83