What is "phone it in"

vb. 1 (rfm-sense) to choose to deliver a message by telephone when etiquette demands the effort and respect conveyed by in person communication 2 (context idiomatic English) To fulfill a responsibility with a minimum effort rather than the appropriate level of effort. 3 (rfm-sense) to make an unseemly, timid performance; to be restrained and timid when bold action is called for