Pvunderink an someone explain to me if the words 'The principal concern is' are common English. Yes, but your punctuation or phrasing for the rest of your sentence is odd. I suggest: The principal concern is the relationship between between the internet and mobile phones.
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Pvunderinkan someone explain to me if the words 'The principal concern is' are common English.Yes, but your punctuation or phrasing for the rest of your sentence is odd. I suggest: