You can select which network modes your mobile phone can use, eg. 3G or GSM. Your choice determines the data speeds you can achieve.
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Select network mode
4G/LTE enables you to achieve higher data speeds than when using 3G or GSM. If you turn on 4G/LTE, your mobile phone automatically switches between the network modes provided you're within range of a 4G/LTE network. If you turn off 4G/LTE, you can't achieve high data speeds.
Tap the indicator next to "Enable 4G" to turn the function on or off.