There may be different network modes available depending on where you are. The network mode influences the data speeds your phone can achieve.
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Press Mobile network.
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Press Mobile data.
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Press Preferred network mode below the required SIM.
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Press the required network mode.
There may be different network modes available depending on where you are. If you set your phone to the fastest network mode, it will always find the network with the highest data speed and best signal.
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Slide your finger upwards starting from the bottom of the screen to return to the home screen.