Dear huff,
thank you for your interesting suggestion. At the moment the two products (Opis 60s mobile and Opis 60s cable) are two completely separate devices, so that a combined fixed-line/mobile use is not possible. We are however always eager to hear from our customers and other interested parties and I will gladly pass your suggestions on to our product managers, so that they will be considered for the future alongside with the other input we have received.
Best regards,