The app may encounter troubles providing its features on stock firmwares by some manufacturers (like MIUI from Xiaomi). There are two known issues so far:
* [Call blocking and informational notifications don't work on MIUI (stock firmware on Xiaomi phones)](https://gitlab.com/xynngh/YetAnotherCallBlocker/-/issues/12).
This problem can be solved by enabling an always-running "monitoring service" (in Yet Another Call Blocker settings). Android requires to display a notification for a service like that, but on Android 8+ you may disable the notification using "notification channels". This feature has no effect on battery life.
Alternatively (or additionally) you may enable the ["Advanced call blocking mode"](FAQ.md#whats-that-advanced-call-blocking-mode) (in Yet Another Call Blocker settings). The feature should help to fix call blocking, though still won't help to provide the informational notifications (except "Call blocked" notifications - these will work fine).
* [No informational notifications on some modern Samsung phones](https://gitlab.com/xynngh/YetAnotherCallBlocker/-/issues/13).
The cause of this problem is unknown (so far) and there's no workaround. Provide system logs (not app logs - these show no anomalies) if you want this fixed.
Yet Another Call Blocker doesn't have a permanent notification since it doesn't have any always-running services. The only actions it may do in background are optional auto-updates and incoming call handling (which are limited to the duration of corresponding events). So yeah, it does work ([unless it doesn't](FAQ.md#calls-arent-blocked-i-dont-get-any-informational-notifications)).
Since [contacts are never blocked](FAQ.md#how-do-blocking-options-work-exactly) (you need to enable "Use contacts" option), you can simply add that specific number to your contacts, and it will be able to call you.
Currently, there's no whitelist feature, but there are plans to eventually implement it. Vote for or discuss it in [#11](https://gitlab.com/xynngh/YetAnotherCallBlocker/-/issues/11) and [#26](https://gitlab.com/xynngh/YetAnotherCallBlocker/-/issues/26).
There's no dedicated option [yet](https://gitlab.com/xynngh/YetAnotherCallBlocker/-/issues/31), but there is a way to achieve the effect: enable "Use contacts" option and create a blacklist pattern matching any number (`*`). The app [never blocks contacts](FAQ.md#how-do-blocking-options-work-exactly), but all unfamiliar numbers will be blocked by this pattern. You will also need to enable "Block hidden numbers" option to have hidden numbers blocked.
"Advanced call blocking mode" is a mode that uses a modern call blocking method ([CallScreeningService](https://developer.android.com/reference/android/telecom/CallScreeningService)-based) which allows to block calls immediately before the phone starts ringing ("normal" mode can't handle incoming calls fast enough, so your phone may ring for a very short period of time before the call is finally blocked).
For this feature to work the app must be set as a "Phone app" (Android 7–9) or a "Caller ID app" (Android 10+). The feature is not available on older Android versions. This feature has no effect on battery life.
**Important**: the app doesn't provide/replace any in-call UI - call handling is delegated to your pre-installed Dialer app (or the "Phone app" selected by you on Android 10+), which is actually used to manage a call.
Obviously, on Android 7–9 you can't enable this feature **and** select a third-party Dialer app. This is a restriction of Android, I'm not aware of any way to work around it.
## I don't want to see some of the informational notifications, can I disable them? Can I change notification priorities?
If you don't want to receive some notifications (like notifications for calls from your contacts), you should use Android's [notification channels](https://www.androidcentral.com/notification-channels) feature to disable particular notification types or change their priorities. Yet Another Call Blocker provides plenty of notification channels for you to customize.
On pre-Android 8 devices there's a couple of notification-related options in the settings.
There's also an option to disable all the informational notifications at once.
## What countries are covered by the offline number database?
I'm not sure to be honest. But I believe most of the world is covered.
## Is there a way to display an overlay/pop-up screen with caller information?
Not yet. If you want this feature, vote for [this issue](https://gitlab.com/xynngh/YetAnotherCallBlocker/-/issues/3).
## I have "block hidden numbers" enabled, but some hidden/"private" numbers are still not blocked.
Hidden number detection is not properly standardized in Android. It took quite some effort to implement the feature as it is, but it was mostly borrowed code and guesswork.
It probably works better in ["advanced call blocking mode"](FAQ.md#whats-that-advanced-call-blocking-mode).
If you receive a hidden call that wasn't blocked, [create a "crash report"](FAQ.md#how-to-report-a-crash-get-app-logs) and send it to me, so I can improve the feature. You can send a report even if you didn't have "block hidden numbers" enabled at the moment - the report should be just as useful.
Partially. There's no proxy settings in the app, but system-wide tunnels should work fine. The initial database download (from gitlab) via Tor previously failed due to gitlab making extra checks, but I implemented a hack that should work for now. You can always perform the initial download (no identifiable information used) using normal internet connection. You can even avoid it by [embedding main DB](FAQ.md#the-app-takes-too-much-storage-space-what-can-i-do).
Unfortunately, the third-party servers block requests from Tor, so daily updates and online reviews are not available via Tor.
There are options for database filtering (in the Advanced settings) that allow to save a lot of storage space by removing data that is not applicable to your region. In many cases this feature can save around 100 MB of space without the app losing any efficiency. Carefully read the option descriptions.
You can also build the app yourself embedding the primary DB (see the optional step in [build instructions](BUILDING.md#clone-the-assets-repo-optional-step-allows-to-avoid-the-initial-db-downloading-after-installation)). This will save around 70 MB (by increasing the APK size by ~25 MB, but decreasing the data size by ~95 MB). You won't need to perform the "initial DB downloading" on first start. The downsides are that you'll eventually (once in a couple of months) have to rebuild the app with a fresh primary DB and you won't be able to update via F-Droid.
Sometimes reporting a sequence of steps to reproduce a problem is enough, but in most cases you need to provide extra information in the form of app logs.
You can get app logs ([logcat](https://developer.android.com/studio/debug/am-logcat) output) right inside the app by going to "Settings -> Advanced settings" and pressing "Export logcat".
If you redact personal data (which you should do), please *replace* numbers (with random numbers, preferably without changing format) instead of *removing* them completely. Otherwise, it is hard to tell whether the number was missing in the app or you removed it. That is especially important when dealing with hidden numbers.
## There's plenty of other \[better looking, with more features\] Android call blocking apps around. Why should I use yours?
You don't have to. If you're happy with some other app - good for you.
This project was started because I needed to help my non-techie relatives fight phone spam. Giving calls and contacts permissions to some proprietary app is just not an option for me.
There's only a few FOSS (free and open source) apps that provide call blocking and none of them has any kind of a crowdsourced blacklist. So I created Yet Another Call Blocker to solve this.
After a while the app got new features, some of which are unique on the FOSS scene (for example, I believe that the "advanced call blocking mode" is not present in any other FOSS spam blocker).
