Get the convertCall app
Version 2.1, published 14 October 2026. For Android 10 and newer.
What it automates
convertCall runs a few automations on a business phone, each switched on or off from the app's Automations screen:
- Reply to calls by SMS. After a call ends, the caller gets your message — one template for every caller, or separate ones for missed calls, answered calls and calls outside business hours. Choose whether to reply to all incoming calls, missed calls only, or answered calls only.
- Business hours. Set when you are open. Outside those hours, either reply with your "we're closed" message or send nothing.
- Call-back reminder. If a missed call has not been returned after a delay you choose, the phone shows a reminder with a Call button.
- Daily summary. A notification at a time you choose: how many calls came in today and how many were replied to.
Why these permissions
The app asks for four permissions, and each one does one job:
- Phone (read phone state). To be told that a call is ringing, and which SIM it rang on, so the reply leaves from the same number.
- Call log. To read the number of the call that just arrived — Android withholds it otherwise — and, only while the call-back reminder is switched on, to check on the phone whether you have rung that missed caller back. That check runs entirely on the phone and its result is never sent anywhere. The app never uploads your call history.
- SMS (send). To send the reply itself, without anyone touching the phone. Only to the number that just called, at most once per caller per period, never to blocked numbers. The app never reads your messages.
- Notifications. For the "watching for calls" notice that keeps the app running between calls, and for the reminder and summary automations.
Why it isn't on Google Play
convertCall sends the reply itself, without anyone touching the phone — that is the whole point of it. Google Play does not allow an app to send SMS on its own unless it is the phone's default messaging app, which convertCall deliberately is not (it never reads your messages). So the app is installed from here instead. Android asks two extra questions when you install an app from outside Play; the steps below walk through them.
Installing it
- First, tell Google Play Protect to let it through. Play Protect blocks installing any app that can send SMS from outside the Play Store — every phone, every time. Open the Play Store, tap your profile picture → Play Protect → the gear icon → switch off Scan apps with Play Protect. (If you skip this, Android shows "App blocked to protect your device" at the install step; do this then and tap Install again.)
- Open this page in Chrome on the phone and tap Download. When the download finishes, tap Open on the notification (or find the file in Chrome's downloads).
- Allow the install. Android will say the phone is not allowed to install unknown apps from Chrome. Tap Settings, switch on Allow from this source, then go back — the install screen returns. Tap Install.
- Switch Play Protect scanning back on (same place as step 1). It does not touch apps already installed.
- Open convertCall and tap Grant permissions. It asks to read the incoming caller's number, to send SMS, to know when the phone rings, and to show notifications — each one is explained on screen, and the app does nothing without them.
- Sign in with your company's convertCall account — the same username and password as this website. Every phone in the company signs in with it.
Updates
The app checks this page's version each time it opens and shows an Update available card when there is a newer one. Tap Update: the new version downloads and installs over the old one, keeping your sign-in and settings. The Play Protect step, if it applied to you, applies again.
If you installed it from Google Play earlier
Uninstall that copy first. A version from Play and a version from here are signed differently, so Android will refuse to install one over the other. Signing in again takes a minute; nothing on the server is lost.
Checking the download
The SHA-256 above is the fingerprint of the exact file we published. If you want to be sure the file you have is ours, compare it — on a computer, certutil -hashfile convertcall.apk SHA256 on Windows or shasum -a 256 convertcall.apk on a Mac.