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Prepositions with nouns

By phone or of phone?

By phone is the standard expression for communication using a telephone. Of phone is generally not idiomatic unless phone is part of a longer noun phrase.

Quick answer

Which form is correct?

Use by phone to mean using the telephone as a method of communication. Of phone is not a normal standalone combination in modern English.

We confirmed the booking by phone.
She prefers to speak by phone rather than by email.

Choose the pattern by meaning

These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.

1
by phone

Method of communication

Use by phone to describe contacting or speaking through a telephone.

I interviewed the candidate by phone yesterday.
They settled the issue by phone.
2
on the phone

Using or talking on a telephone

Use on the phone when someone is currently speaking using a telephone.

She is on the phone right now.
I spent an hour on the phone with support.
3
phone + noun

Noun compounds with phone

Phone often appears directly before another noun without a preposition.

phone call records were reviewed.
phone screen interviews are common now.

See the difference in context

The same subject can take different constructions because each sentence answers a different question.

Construction
Example
Meaning
by phone
We arranged the meeting by phone.
using the telephone as a communication method
of phone
the battery of the phone
possible only when of introduces possession or description, not communication method
on the phone
He is on the phone with a client.
currently using the telephone
over the phone
They explained the process over the phone.
through a telephone conversation

Common mistakes

Some combinations appear in real text but do not mean what learners often assume.

Using of phone for communication

English uses by phone or over the phone for communication methods.

✕ We discussed it of phone. ✓ We discussed it by phone.

Confusing by phone and on the phone

By phone describes the method. On the phone describes being engaged in a call.

✕ She was by phone for an hour. ✓ She was on the phone for an hour.

Quick practice

Choose the expression that matches the intended meaning.

1. We completed the interview ___ phone.
2. He is currently ___ the phone.
3. Which phrase is not idiomatic for communication method?

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Frequently asked questions

Is of phone ever correct?

Only inside larger noun phrases such as the screen of the phone. It does not mean communication by telephone.

Can I say over the phone instead of by phone?

Yes. Over the phone is common when talking about conversations or explanations during a call.

What is the difference between by phone and on the phone?

By phone describes the method of contact. On the phone describes actively talking using a phone.

"behind bar" or "of bar"? "beyond description" or "of description"? by, accident, of, accident "by boat" or "of boat"? "by chance" or "of chance"? "by default", "in default" or "of default"? "by extension", "of extension" or "for extension"? "by lot" or "with lot"? by, of, for, in or agreed-upon definition? by, of, in, into or to category? by, of, in, via or on telephone? by, of, on, for or in bus?

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