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The Galaxy S9+ supports dual sim cards. If buying an unlocked one, can it have both Verizon and T-Mobile running on it at once?

Also, if so, how does it know which one to use for data like if using tethering?

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  • I don't know about the S9, but most dual-SIM phones that I've seen only use the secondary SIM for calls and SMS, and not data. It's essentially just a means of providing a second phone number for the device. Only the primary SIM is used for data.
    – eldarerathis
    Mar 8, 2018 at 20:36
  • @eldarerathis Okay, thanks. Do you know if it would be able to use both T-Mobile and Verizon for calls and SMS?
    – g491
    Mar 8, 2018 at 21:27

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