This guide will show you how to switch between 2G and 3G if you experience problems in the network.
NOTICE: SCREEN IMAGES MAY DIFFER FROM YOUR ACTUAL DEVICE.
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Select Settings
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Select More...
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Select Mobile networks
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Select Preferred networks
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Select Network Mode
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Select WCDMA only to enable 3G and GSM/WCDMA (auto mode) to enable 2G/3G