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    Selecting a SIM card for data traffic

    This function only applies for Dual SIM devices.

    If you are using a Dual SIM device, you can select which SIM card handles data at any given time. You can do this during the initial setup of your device, or you can select or change it later via the Settings menu.

    To change the SIM card used for data traffic

    1. Find and tap Settings > Network & Internet > Dual SIM > Mobile data.
    2. Select the SIM card that you want to use for data traffic.

    For higher data speeds, select the SIM card that supports the fastest mobile network, for example, 3G.

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    On your Xperia™ device, go to Settings > About phone/tablet > Model number