You can set your phone to select a network automatically or you can select a network manually. If you select a network manually, your phone will lose network connection when the selected network is out of reach.
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Step 2 of 9
Press Mobile network.
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Press Mobile data.
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Press Network provider below the required SIM.
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Press the indicator next to "Automatic" to turn off the function.
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Press OK and your phone will search for networks.
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Press the required network.
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Press the indicator next to "Automatic" to turn on the function.
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Slide your finger upwards starting from the bottom of the screen to return to the home screen.