Formatting A Phone Call in a Script (Intercut vs. One Side)

Your character picks up the phone. Someone on the other end is talking. The reader is already confused—are we in the kitchen or the car? Who is speaking? Half the scripts that land on desks botch this exact moment. Not because the writer doesn't understand the scene (they do), but because they never learned that phone calls have a grammar all their own. Two people in two separate places having one conversation. The page has to make that spatial and vocal relationship clear in a glance, without forcing the reader to re-read or guess. When it doesn't, the reader stumbles. And stumbling readers put scripts down, often for good.

Format tells the reader where to look, and in a phone call, that directional clarity is half the drama and half the comprehension.

The choice between intercut and one-side isn't cosmetic or arbitrary. Intercut and one-side are fundamentally different tools with different narrative functions. Each shapes pacing, controls information flow, and dictates where the audience's attention and loyalty sit during the call. Pick the wrong one and you're either overcutting a quiet, intimate moment that needed stillness, or burying tension and reaction beats that needed room to breathe and build.

Free tool: use the Slugline Formatter to clean up and standardize your scene headings so they stay consistent and production-ready.

What You're Really Deciding

A phone call in life is one continuous event happening in real time. On the page it's two locations, two separate blocks of action, and dialogue that has to be assigned to the right speaker in the right place. The format you choose tells the production team how to shoot it—single setup or coverage on both ends—and tells the reader how to experience it emotionally and spatially. One-side means we stay with one character for the entire conversation. We hear their half of the exchange. We see their face, their reactions, their environment. The other voice is offscreen (V.O.), filtered through the phone, or we never cut to them at all. Intercut means we move back and forth between both sides—kitchen, then car, then kitchen again, ping-ponging as needed. We see both faces. We watch both reactions. We experience both environments and both emotional states in real time.

Think about the last phone call that mattered in a film you loved. Heat. Pacino and De Niro. That diner scene could have been a phone call; the tension was the same. Two people. One conversation. The decision to show one face or both wasn't arbitrary. It was storytelling.

The One-Side Call: When to Use It

Use one-side when the reaction is the story. We don't need to see the person on the other end. We need to see the character we're with,their face falling, their hand tightening on the receiver, the way they go very still. The information is in the dialogue we hear, but the drama is in the face we watch.

Picture a detective in a cramped office. The phone rings. It's the lab. We stay on the detective. We hear the technician's voice (V.O. or O.S., depending on how you handle it). We never cut to the lab. We don't need to. The detective's slow exhale, the pen dropping,that's the scene. Cutting away would dilute it. One-side keeps the emotional focus tight. It also saves pages. You're not writing two scene headings, two action blocks, two reaction beats. You're writing one. For a script that's already long, or a moment that's intimate, one-side is the lean option.

There's a catch. If the person on the other end has equal dramatic weight,if their reaction matters as much, or if the power dynamic of the call is the point,one-side can feel like you're hiding. The audience will wonder what the other character looked like when they said that. If that wondering is productive (mystery, offscreen threat), lean in. If it's just you avoiding the work of writing both sides, fix it.

The Intercut: When You Need Both Faces

Intercut when the exchange is the story. When every line lands on someone's face. When the cut itself has rhythm,silence on one side, then the other character's reply, then a cut that underlines the beat. Intercuts are standard for confrontations, negotiations, breakups, and revelations. Both people have stakes. Both reactions pay off.

Format is straightforward. You establish both locations with standard scene headings. Then you use INTERCUT or INTERCUT BETWEEN [LOCATION A] AND [LOCATION B] so the reader (and the editor, later) knows we're in a back-and-forth phone conversation. After that, you use minimal scene headings or just character names and dialogue. You don't repeat full slug lines every time you switch locations. You write "JANE" or "JANE (ON PHONE)" and the dialogue, then "MIKE (ON PHONE)" and his response. The INTERCUT heading does the heavy lifting by signaling the alternating structure. As discussed in our guide on screenplay format and scene structure, clarity for the reader and the production draft matters more than decorative headings or redundant formatting.

Intercuts eat more page space than one-sided phone scenes. You're tracking two physical spaces, two separate action lines, two emotional arcs unfolding in real time. They also give you the ability to use the cut itself as punctuation—a storytelling tool. Hang on one character's silence a beat too long, let the pause breathe, then cut to the other character's reaction. The rhythm and pacing of the scene lives in those transitions between locations.

A Side-by-Side Look at the Mechanics

Approach	Best for	Page impact	Emotional focus
One-side	Reaction-driven; one character's POV; tight scripts	Fewer lines, one location	Single character
Intercut	Confrontation; negotiation; both reactions matter	More lines, two locations	Both characters
Hybrid (one-side then cut)	Twist or reveal; we think we know the situation, then we see the other side	Variable	Shifts mid-call

Hybrid is the third option. Start one-side. We're with the detective. We hear the bad news. Then,one cut to the other location. The caller, hanging up, calm. We realize they were lying, or relieved, or already moving. The single cut lands because we've been denied that face until now. Use it sparingly. Once per script, maybe. The trick loses power if you repeat it.

Relatable Scenario: The Bad News Call

Maya is at home. Her brother calls from the hospital. If you write this one-side, we stay with Maya. We hear her brother's voice (O.S. or V.O.,more on that below). We watch her sit down, we watch her cry, we watch her hang up and sit in silence. We never see the brother. The scene is about her receiving the news. One location. One emotional throughline.

If you write it intercut, we see the brother in a corridor, phone to his ear, struggling to keep his voice steady. We see Maya's face when he says the words. We cut back to him after he hangs up,maybe he slides down the wall, maybe he just walks away. Now the scene is about both of them. The choice changes what the scene is. Not just how it's formatted.

Relatable Scenario: The Negotiation

Two executives. One in LA, one in Tokyo. They're closing a deal. Every line is a probe or a parry. If we only stay with one, we're guessing at the other's tells. The scene works better as an intercut. We see the LA exec's smirk when he lowballs. We see the Tokyo exec's pause, the slight nod. The negotiation is a duel. We need both duelists on screen.

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The V.O. vs. O.S. Question

Voice-over (V.O.) typically means the speaker is not in the physical space,they're on the phone, or we're hearing their thoughts, or a narrator. Off-screen (O.S.) means the speaker is in the scene but not visible,in the next room, or on the other end of the line. Many pros use V.O. for the distant party in a phone call: they're not in the room, so their voice is "over" the scene. Others reserve O.S. for any voice we hear but don't see. Both are accepted. The important thing is consistency. Pick one convention and stick with it for the whole script. As with how to describe sound effects in a screenplay, small formatting choices add up to a professional read.

What Beginners Get Wrong (The Trench Warfare Section)

Writing both sides as full scenes. They write INT. MAYA'S APARTMENT, NIGHT, then later INT. HOSPITAL CORRIDOR, NIGHT, and repeat full slug lines every time they switch locations. The script bloats to double its natural length. The reader gets whiplash flipping between locations. Fix: One INTERCUT heading at the top, then just character names and dialogue flowing back and forth. Only reslant to a full scene heading if we leave the call entirely — for example, someone hangs up and the scene continues in one location with new action.

Using intercut when one-side would do the job better. A quick check-in call where someone says "I'm on my way" or "Got it, see you soon" doesn't need two locations eating up screen real estate. Stay with the character we care about in that moment. Use intercut when the other character's presence on screen — their reaction, their environment, their body language — earns its keep and adds meaning the audience needs to see.

Forgetting that we can't see the other person in one-side calls. In one-side calls, the dialogue from the other end has to stand completely alone without visual support. They can't rely on a meaningful look, a raised eyebrow, or a pause that we'd see if the camera were there. Everything the audience gets from that side is embedded in the line itself. So those lines need to be clear, loaded with subtext, or deliberately cryptic by design — not vague by accident or lazy writing.

Overdirecting the intercut with constant cutting instructions. "We cut to Sarah. We cut back to James. Cut to Sarah again." You don't need to spell out "we cut" every single time the perspective shifts. INTERCUT implies the back-and-forth rhythm. Write the dialogue and the action; the editor will cut between them. Specify a cut only when the timing is critical to the emotional beat — for example, "Hold on Sarah's face for a beat after James hangs up" or "Cut to him mid-sentence."

Making the offscreen voice a non-entity with no personality. In one-side calls, the other character still has to sound like a full human being with dimension. Give them a distinct rhythm, a vocabulary, a mood that comes through in word choice. "Hello. Yes. Okay. Goodbye." reads like placeholder dialogue or a temp track. Who are they as a person? Nervous? Cold? In a rush? Evasive? The lines we hear are all the audience has to build that character. Make them count and make them specific.

Ignoring the hang-up. How the call ends is a beat. Someone hangs up first. Someone is left listening to dead air. Someone says "I have to go" and we feel the lie. Don't race to the next scene. The moment after the call,the character alone with what they just heard,often carries more weight than the call itself.

Step-by-Step: Formatting an Intercut Call

Establish both locations. Write the first scene heading (e.g., INT. KITCHEN , NIGHT) and a short action line. Then the second (INT. CAR , NIGHT) and its action. One of them picks up, or we're already in the call. Next line: INTERCUT , KITCHEN / CAR. From here on, you don't need to repeat INT. KITCHEN or INT. CAR unless the scene stops being a phone call (e.g., someone exits the car). Write character name, (ON PHONE) if it helps, then dialogue. Action lines go under the character they apply to. When the call ends, you can write "END INTERCUT" and continue in one location, or just continue with a single scene heading. Done.

Step-by-Step: Formatting a One-Side Call

Single scene heading. INT. MAYA'S APARTMENT , NIGHT. Action: Maya's phone rings. She answers. Then dialogue. For her lines, it's just MAYA. For the caller, use JAKE (V.O.) or JAKE (O.S.) and the line. We never leave the apartment. When Jake hangs up, the scene continues with Maya,her reaction, her next move. No second location, no INTERCUT.

Relatable Scenario: The Threat

A woman at home. Unknown caller. If we stay one-side, we're in the room with her. We hear the voice,distorted, cold,and we watch her fear. We don't need to see the caller. The menace is in the unknown. Cutting to the caller would demystify. One-side preserves the dread. If the story later reveals who was on the line, that revelation can land in a different scene. Here, the phone call is about her isolation. One location. One face.

When the Script Reader Stumbles

Readers see hundreds of scripts. When they hit a phone call that's formatted wrong, they don't re-read to decode it. They skim. They guess. Or they mentally check out. Sloppy formatting reads as inexperience. It doesn't matter if your story is strong; the first impression is "this writer doesn't know the craft." Clean formatting is invisible. It gets out of the way. The reader stays in the scene instead of puzzling over who's talking. That's the real reason to care. Not rules for rules' sake,because you want the person holding your script to stay in the story.

The One List You Need

• Use INTERCUT only after establishing both locations once.
• In one-side calls, tag the offscreen voice consistently (V.O. or O.S.) and don't switch mid-script.
• Never repeat full slug lines for every beat of an intercut; use character names and (ON PHONE) after the initial INTERCUT.

Everything else is judgment. Who drives the scene? Who needs to be seen? Answer that, then format accordingly.

When the Call Is the Whole Scene

Sometimes the phone call isn't a beat inside a larger scene,it's the scene. One location or two. One conversation. The entire dramatic weight is in the exchange. In that case, the format choice (one-side vs. intercut) is even more important. You're not cutting away to action. The dialogue and the reactions are the action. So the rhythm of the cuts (in an intercut) or the sustained focus (in one-side) has to carry the scene. Read the scene aloud. If it's one-side, does the offscreen voice have enough presence? If it's intercut, does each cut earn its place? When the call is the whole scene, there's nowhere to hide. The formatting has to be clean and the beats have to land.

The Perspective

Phone calls are not filler. They're two people in two places, sharing one moment. The format you choose,one-side or intercut,is a narrative choice. It decides who we look at, who we feel with, and how much we know. Get the grammar right so the reader never has to guess. Then use that grammar to make the call do real dramatic work.