You cannot. The TFT does not recognise dual sim systems. The workaround is to set your phone to default to one of your sims for your contacts and new numbers to call. Same problem exists with Apple's ecosystem, although at least with an iPhone you don't get lockups just a dial-out with the wrong sim for the contact.New question: how can I use a dual sim mobile with the tft? My Samsung S10e is set to ask me which sim to use in a popup before making a call. On the tft the popup doesn't appear, it only shows the initiate call screen but it won't go out just freeze.