Four decades ago, mobile phones were rarely used. (Few people were using it.)
Six decades ago, mobile phones were hardly used. (No one was using it.)
Please check them.
kumenglish Four decades ago, mobile phones were rarely used. ) Six decades ago, mobile phones were hardly used. ) In the second sentence I think you were trying for Six decades ago, mobile phones were not used (at all).
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kumenglishFour decades ago, mobile phones were rarely used. (Few people were using it.)
Six decades ago, mobile phones were hardly used. (
No oneVery few people werewasusing it.)
In the second sentence I think you were trying for
Six decades