One UI

Samsung Galaxy setup

On One UI Samsung moves rarely used apps into a "sleep" state and limits their background work — so call notifications disappear and reminders arrive late. Below is how to exclude ProZvonki from sleeping and, separately, how to set it as the default phone app (on some Galaxy models the "Phone" entry is hidden where you don't expect it).

Step 1. Allow background activity

Open Settings → Apps → ProZvonki → Battery and choose Unrestricted. This lets the app receive calls and notifications while the screen is off.

Step 2. Add to never-sleeping apps

Open Settings → Battery (Device care) → Background usage limits → Never sleeping apps and add ProZvonki. Also make sure the app is not in the Sleeping or Deep sleeping lists.

Step 3. Turn off auto-disable

In Battery settings (⋮ menu → Settings) turn off Auto-disable unused apps and Put unused apps to sleep. Otherwise, after a few days without opening it, the system will put the app to sleep again.

Step 4. Allow exact alarms and notifications

Open Settings → Apps → ProZvonki → Alarms & reminders and grant the permission (Android 12+). Make sure the app's notifications are enabled.

Step 5. Set as the default phone app

Open Settings → Apps → ProZvonki → Set as default → Phone app and pick ProZvonki. On some Galaxy models the "Phone" entry is missing from the general "Default apps" list — in that case set it here, from the app's own page.

About the default phone app: if the "Default apps" screen has no "Phone" entry, that's a One UI quirk, not an error. You can set the phone app from the app's own page (step 5).

FAQ

Frequently asked questions — Samsung

The app puts itself to sleep

Add it to "Never sleeping apps" (step 2) and turn off "Auto-disable unused apps" (step 3). These two settings solve the sleeping problem on One UI.

There's no "Phone" entry under Default apps

That happens on some Galaxy models. Open the app page: Settings → Apps → ProZvonki → Set as default → Phone app — and pick ProZvonki there.

Notifications arrive with a delay

Check that the app is set to Unrestricted under Battery (step 1) and that exact alarms are allowed (step 4). Power saving mode also delays background tasks — keep it off if you can.