# Callsign: Desk Busy Sign — Lets the room know you’re busy

> Lets the room know you’re busy (iPhone/iPad app by Moosa BV.)

- Source: https://appshunter.io/ios/app/callsign-desk-busy-sign/id6816474457 (this page in markdown: same URL + `.md`)
- Developer: [Moosa BV](https://appshunter.io/developer/968498137)
- Category: Productivity, Business
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 27.0 · 5 MB
- Languages: British English
- Released: 2026-10-23
- Data updated: 2026-10-25

## What is Callsign?

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.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Callsign Pro | $6.99 | one-time |
| Game room | $1.49 | one-time |
| Scores & timers | $1.49 | one-time |
| Retro | $1.49 | one-time |
| On air | $1.49 | one-time |
| Machines | $1.49 | one-time |
| Home | $1.49 | one-time |
| Calm | $1.49 | one-time |
| All sign packs | $4.99 | one-time |
| Out and about | $1.49 | one-time |


## Is Callsign safe?

Not enough ratings yet to assess Callsign.

## Is Callsign legit?

Callsign: Desk Busy Sign appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for Callsign is 68 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0 — 2026-10-23

No release notes.

## More apps by Moosa BV

- [Downtime - your bucket list.](https://appshunter.io/ios/app/downtime-your-bucket-list/id1141688014)

All apps by Moosa BV: https://appshunter.io/developer/968498137

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-25.*