An Android Call/SMS blocker. (Android 10+)
| Call | SMS | Setting | Notification |
|---|---|---|---|
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| For Call | For SMS | |
|---|---|---|
| What it does | Block unwanted calls | Silence unwanted notificaions |
| What it doesn't | Replace the default call app | Replace the default SMS app |
| How it works | Act as CallScreeningService, aka the default caller ID & spam app |
It takes over the notification of new messages. |
| Filters supported (explained below) |
1. Phone number (regex) 2. Contacts 3. STIR 4. Repeated call 5. Recent apps 6. Dialed |
1. Phone number (regex) 2. Contacts 3. SMS content (regex) |
| Filter | It checks |
|---|---|
| Contacts | Whether it's from a contact |
| STIR | STIR attestation result |
| Repeated | Whether the number has been calling repeatedly |
| Dialed | Whether the number has been made outgoing calls |
| Recent Apps | If some specific apps have been used recently, all calls are allowed. A typical use case: You ordered a pizza in PizzaApp, soon they call you to refund because they are closing. That call would be permitted if PizzaApp is enabled in this list. |
| Off Time | A time period that always permits calls, usually no spams at night. |
| Regex Pattern | Some typical patterns: - Any number: .* (the regex .* is identical to the wildcard * in many other apps) - Exact number: 12345 - Starts with 400: 400.* - Ends with 123: .*123 - Shorter than 5: .{0,4} - Longer than 10: .{11,} - Starts with 400, has country code 11 or not: (?:11)?400.* - Contains "verification": .*verification.* - Extract verification code from SMS message: code.*?(\d+)You can ask AI to generate or explain regex for you: "Show me regex for checking if a string starts with 400 or 200" Results in (400|200).* |
| Permission | Why |
|---|---|
| ANSWER_PHONE_CALLS | Reject, Answer and Hang-up calls |
| POST_NOTIFICATIONS | Show notifications |
| READ_CONTACTS | For matching contacts |
| RECEIVE_SMS | For receiving new messages |
| READ_CALL_LOG READ_SMS |
For feature: Repeated Call/Dialed (check if it's repeated) |
| PACKAGE_USAGE_STATS | For feature: Recent Apps For checking whether an app has been used recently |
| READ_PHONE_STATE | For block mode: Answer + Hang-up (monitor ringing state) |
| Problem | Solution |
|---|---|
| SMS notification doesn't work after app is killed | Enable "app auto start" in battery settings: System Settings -> Battery -> ... -> Auto-start Manager -> enable SpamBlocker |
| How to always block particular number regardless of how many times it repeats, or within OffTime, etc... | Set a regex rule with higher priority than 10. |
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