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The Samsung Galaxy S8 will support dual SIM (but yours might not) - CNET
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Convert single SIM Galaxy S8 Plus to Dual SIM with SIMore Speed ZX-Twin Nano SIM adapter for Android device | Transform any single SIM Samsung Galaxy S8 Plus into Dual SIM smartphone
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Convert single SIM Galaxy S8 Plus to Dual SIM with SIMore Speed ZX-Twin Nano SIM adapter for Android device | Transform any single SIM Samsung Galaxy S8 Plus into Dual SIM smartphone