Why is my phone not switching to 5G?

It’s happening because whenever the signal quality decreases, your phone searches for an Alternative, with a better quality . Then let it be a 3G connection. So, You need to go to settings>mobile network>and swich from Auto(LTE/3G/2G) to LTE.20 Eyl 2019

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Switch between 3G/4G/5G – Samsung Android

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