Is it "who should I call" or "whom should I call"?

A little morei

You would call him, not he, which means the object form whom is correct. "Who should I call" is common in speech and rarely sounds wrong. Edited prose still prefers "whom."

The full entryii

More quick answersiii

• → What's the difference between "who" and "whom"? Who is the subject — it does the action. Whom is the object — the action happens to it.
• → When do I use "whom"? Use whom when the pronoun is the object of a verb or preposition — when something is done to it.
• → Is it "who to blame" or "whom to blame"? "Whom to blame." The blame is being done to someone — the object slot calls for whom.