The k40 isn't just 5g.
With 5G terminals, in the 5G network coverage area, the use of 5G network is given priority, and when the network environment is not good, it will automatically switch to 4G network or even 3G network.
The use of 5g networks is necessary to use 5g mobile phones, which is because 5G uses new technologies and frequencies, if users want to experience 5G networks, they must replace mobile phones that support 5G network bands. However, after the commercial popularization of 5G, 4G networks can still be used normally for a period of time, so there is no need to worry about 4G mobile phones being unable to be used in the 5G era.
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k40 supports 5g, if you do not use 5g you can choose to turn off 5g service, so that you can continue to use 4g or other services.
If you are temporarily unable to use 5G network or your area is not covered by 5G network, you can open the Settings -- dual SIM and mobile network, turn off the \"Enable 5G network\" switch, and then open at any time when needed
After the shutdown, the phone will no longer be connected to the 5G network, and the power consumption related to the signal will be reduced