When you have two
nano SIM cards inserted on your phone, only one card can connect to the faster 4G LTE network. The other card will connect to the 3G/2G network.
You can set which card you want to connect to the 4G LTE network.
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From the Home screen, swipe up and then tap .
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Tap
Preferred data network.
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Choose the card you want to connect to the 4G LTE network.