phone it in

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• verb this sense?) to choose to deliver a message by telephone when etiquette demands the effort and respect conveyed by in person communication
• verb idiomatic To fulfill a responsibility with a minimum effort rather than the appropriate level of effort.
• verb this sense?) to make an unseemly timid performance; to be restrained and timid when strident action is called for