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When life was normal most of us had both mobile data _and_ WiFi on our phones turned on.
If you are at home and rarely go out, you should really turn off either your WiFi or your mobile data. You don't need both if you're in the house most of the time.
With both on, you deplete your battery more quickly. This means higher electricity costs. OK I know it doesn't amount to much but did you ever think that you are needlessly reducing your battery life? After all, every battery has a finite lifetime depending on how much you use it and how many times you charge it.