How to change the preferred network type on my Huawei P20

Click each step to see the action. You can also click the picture or use the arrow keys.

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You can select a preferred network type for your Huawei P20. This setting will influence the data speeds you receive over the mobile network.
1. Touch Settings.
2. Touch Wireless & networks.
3. Touch Mobile network.
4. Touch Preferred network type.
5. Touch the desired option, e.g., LTE/WCDMA/GSM auto.
6. The preferred network type has been changed.