on/over phone

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  • Andygc

    Senior Member
    British English
    As we informed you by phone, we shall be starting our marketing campaign in Asia from next month.

    Your "as informed over/on/by phone" is ungrammatical, since it can only refer to "we". It seems unlikely that you would be telling somebody that you have informed yourself in a phone conversation. In addition, if you wanted to use "over" or "on", it would have to be "the phone" - but "by phone" is the normal phrase.

    I suggest that you read about "dangling participles" (link to University of Bristol) - "informed" in your sentence is a dangling participle.
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