What does "phone in" mean?

To deliver a message by telephone when etiquette demands the effort and respect conveyed by communication in person.

What is a synonym for "phone in"?

Common synonyms include: phones, telephone.

verb

verb ·Rare ·Advanced level

Verb

1
To deliver a message by telephone when etiquette demands the effort and respect conveyed by communication in person. ambitransitive
"Please give us the courtesy of showing up instead of phoning in."
2
To make a telephone call to a broadcasting station, especially to participate in a program being aired. intransitive
"We've got Brian phoning in from Phoenix. Brian, you're on the air."
3
To fulfill a responsibility with a minimum effort rather than the appropriate level of effort. ambitransitive, figuratively, idiomatic
"phone it in"
4
To make an unseemly, timid performance; to be restrained and timid when bold action is called for. transitive

"Please give us the courtesy of showing up instead of phoning in."