call

I'll call you when I arrive.

Forms

calls v. (3rd-person singular)
She calls her parents every Sunday.
called v. (past)
He called the restaurant to make a reservation.
calling v. (present participle / gerund)
Calling his office didn't help, so I sent an email.
caller noun.
The caller on the radio asked a question about traffic.

call back
To return a phone call.
I missed her call; I'll call back after lunch.
call off
To cancel an event or arrangement.
They called off the meeting because the manager was sick.
call up
To phone someone.
I'll call up the mechanic to ask about my car.
call in
To phone a place (often work) to report or request something.
If you're unwell, call in to let HR know.
call out
To publicly criticize or challenge someone.
Employees called out the company for ignoring safety concerns.
call on
To ask someone to speak or to do something (often in a group or meeting).
The teacher called on three students to present their projects.
call for
To demand or require; to be appropriate for.
This situation calls for a quick decision.
call around
To phone several people or places to ask about something.
I called around to find which pharmacies had the vaccine in stock.
call into question
To doubt or challenge the truth or validity of something.
New evidence calls into question the accuracy of the report.