Callsign: Desk Busy Sign
Lets the room know you’re busy
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Your iPhone tells the room you're on a call. Fold an iPhone Duo into a tent, or stand any iPhone on your desk, and the sign follows your calendar.
Callsign turns your iPhone into a sign that tells the room when you're on a call, so people know when to come in and when to wait.
It reads your calendar. When a meeting starts, the sign goes up; when it ends, it says you're free. No buttons to press, nothing to remember.
MADE FOR IPHONE DUO
Fold your Duo into a tent and the sign faces the room on the outer display. Fold it to 90° like a laptop and the sign stands on the top half, with the time left and your call controls below. On any other iPhone, stand it on your desk and put the sign up full screen.
SIGNS FOR EVERY MOOD
Start free with Classic: green when you're free, red when you're busy, with the time you'll be back. Callsign Pro adds a countdown, a loading bar, a traffic light, neon, a pixel-art mountain sunset and more. Sign packs add the fun ones: Breakout and Pong that play out over your meeting, a bouncing DVD-style sign, a microwave that dings when you're free, a lava lamp and plenty more.
CALL CONTROLS
With Callsign Pro and Callsign for Mac, mute, turn your camera off, raise your hand or leave the call from your phone. Works with Zoom, Google Meet and Microsoft Teams.
MAKE IT YOURS
Customize the words, colors and fonts on any sign you own. Let Random pick a different sign for each call. Use all your calendars at once.
KIND TO YOUR SCREEN
Minimal versions of every sign draw thin lines on pure black, so most of the screen stays dark. A screen saver and a slow drift keep the words from burning in.
PRIVATE
Callsign reads your calendar on your iPhone. Your events aren't uploaded anywhere.
PAY ONCE
Callsign Pro and each sign pack are one-time purchases. No subscription.
Ratings & Reviews
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The developer, Moosa BV, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Moosa BV
- Size
- 5.8 MB
- Category
- Productivity
- Compatibility
Requires iOS 27.0 or later.
- iPhone
Requires iOS 27.0 or later. - Mac
Requires macOS 27.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 27.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Out and about $1.49
- All sign packs $4.99
- Calm $1.49
- Home $1.49
- Machines $1.49
- On air $1.49
- Retro $1.49
- Scores & timers $1.49
- Game room $1.49
- Callsign Pro $6.99
- Copyright
- © 2026 Mo Moosa