by telephone
Method of communication
Use by telephone to explain how communication happens.
The interview was conducted by telephone.
By or on telephone?
Use by telephone to describe a communication method and on the telephone to describe someone using the phone. Other combinations are rare or nonstandard in modern English.
Quick answer
Common prepositions with telephone
By telephone describes the method of communication. On the telephone describes someone engaged in a phone conversation. Via telephone is possible in formal or technical contexts. Of telephone and in telephone are not standard combinations for this meaning.
We confirmed the booking by telephone.
She was on the telephone for an hour.
Support is available via telephone and email.
She was on the telephone for an hour.
Support is available via telephone and email.
Choose the pattern by meaning
These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.
on the telephone
Using the phone
Use on the telephone when someone is speaking or occupied with a phone call.
I cannot talk now because I am on the telephone.
via telephone
Formal communication channel
Via telephone is formal and common in instructions, services, or technical writing.
Customers may respond via telephone.
telephone call
Telephone as a modifier
Telephone often appears before another noun without a preposition.
telephone call records were reviewed.
See the difference in context
The same subject can take different constructions because each sentence answers a different question.
Construction
Example
Meaning
by telephone
We spoke by telephone yesterday.
Shows the method of communication.
on the telephone
He is on the telephone with a client.
Shows that someone is currently using the phone.
via telephone
Appointments can be arranged via telephone.
Formal way to describe communication through the phone system.
of telephone
The phrase of telephone is not idiomatic for communication method.
Not a standard combination in modern English.
in telephone
In telephone is not used to mean by phone.
Usually nonstandard unless telephone is part of a larger phrase such as in telephone sales.
Common mistakes
Some combinations appear in real text but do not mean what learners often assume.
Using in telephone for communication
English normally uses by telephone, not in telephone, for communication method.
✕ We discussed it in telephone. ✓ We discussed it by telephone.Using of telephone as a fixed phrase
Of telephone is not a natural expression for phone communication.
✕ The details were confirmed of telephone. ✓ The details were confirmed by telephone.Confusing by telephone and on the telephone
By telephone describes method, while on the telephone describes activity.
✕ She arranged the meeting on telephone. ✓ She arranged the meeting by telephone.Quick practice
Choose the expression that matches the intended meaning.
1. We completed the interview ___ telephone.
2. He is ___ the telephone right now.
3. Customers may contact us ___ telephone.
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Frequently asked questions
Is by telephone still common?
Yes. It is standard English for describing communication by phone.
Can I say on telephone without the?
In standard English, on the telephone is much more natural.
Is via telephone formal?
Yes. It often appears in business, technical, or official writing.
Related preposition guides
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