diff --git a/app/src/main/kotlin/com/simplemobiletools/dialer/extensions/Call.kt b/app/src/main/kotlin/com/simplemobiletools/dialer/extensions/Call.kt
index d48216ae..53ad1d1b 100644
--- a/app/src/main/kotlin/com/simplemobiletools/dialer/extensions/Call.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/dialer/extensions/Call.kt
@@ -1,5 +1,6 @@
 package com.simplemobiletools.dialer.extensions
 
+import android.net.Uri
 import android.telecom.Call
 import android.telecom.Call.STATE_CONNECTING
 import android.telecom.Call.STATE_DIALING
@@ -41,3 +42,18 @@ fun Call.isOutgoing(): Boolean {
 fun Call.hasCapability(capability: Int): Boolean = (details.callCapabilities and capability) != 0
 
 fun Call?.isConference(): Boolean = this?.details?.hasProperty(Call.Details.PROPERTY_CONFERENCE) == true
+
+fun Call.getCallerNumber(): String? {
+    val handle = try {
+        details?.handle?.toString()
+    } catch (e: NullPointerException) {
+        null
+    }
+    if (handle != null) {
+        val uri = Uri.decode(handle)
+        if (uri.startsWith("tel:")) {
+            return uri.substringAfter("tel:")
+        }
+    }
+    return null
+}
diff --git a/app/src/main/kotlin/com/simplemobiletools/dialer/services/CallService.kt b/app/src/main/kotlin/com/simplemobiletools/dialer/services/CallService.kt
index 58b0d517..7c859dd4 100644
--- a/app/src/main/kotlin/com/simplemobiletools/dialer/services/CallService.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/dialer/services/CallService.kt
@@ -5,10 +5,10 @@ import android.content.ActivityNotFoundException
 import android.content.Context
 import android.telecom.Call
 import android.telecom.InCallService
+import com.simplemobiletools.commons.extensions.isNumberBlocked
+import com.simplemobiletools.commons.extensions.normalizePhoneNumber
 import com.simplemobiletools.dialer.activities.CallActivity
-import com.simplemobiletools.dialer.extensions.config
-import com.simplemobiletools.dialer.extensions.isOutgoing
-import com.simplemobiletools.dialer.extensions.powerManager
+import com.simplemobiletools.dialer.extensions.*
 import com.simplemobiletools.dialer.helpers.CallManager
 import com.simplemobiletools.dialer.helpers.CallNotificationManager
 import com.simplemobiletools.dialer.helpers.NoCall
@@ -27,21 +27,27 @@ class CallService : InCallService() {
 
     override fun onCallAdded(call: Call) {
         super.onCallAdded(call)
-        CallManager.onCallAdded(call)
-        CallManager.inCallService = this
-        call.registerCallback(callListener)
+        val number = call.getCallerNumber().orEmpty()
+        if (!call.isOutgoing() && !call.isConference() && isNumberBlocked(number.normalizePhoneNumber())) {
+            call.reject(false, null)
+            return
+        } else {
+            CallManager.onCallAdded(call)
+            CallManager.inCallService = this
+            call.registerCallback(callListener)
 
-        val isScreenLocked = (getSystemService(Context.KEYGUARD_SERVICE) as KeyguardManager).isDeviceLocked
-        if (!powerManager.isInteractive || call.isOutgoing() || isScreenLocked || config.alwaysShowFullscreen) {
-            try {
-                callNotificationManager.setupNotification(true)
-                startActivity(CallActivity.getStartIntent(this))
-            } catch (e: ActivityNotFoundException) {
-                // seems like startActivity can thrown AndroidRuntimeException and ActivityNotFoundException, not yet sure when and why, lets show a notification
+            val isScreenLocked = (getSystemService(Context.KEYGUARD_SERVICE) as KeyguardManager).isDeviceLocked
+            if (!powerManager.isInteractive || call.isOutgoing() || isScreenLocked || config.alwaysShowFullscreen) {
+                try {
+                    callNotificationManager.setupNotification(true)
+                    startActivity(CallActivity.getStartIntent(this))
+                } catch (e: ActivityNotFoundException) {
+                    // seems like startActivity can thrown AndroidRuntimeException and ActivityNotFoundException, not yet sure when and why, lets show a notification
+                    callNotificationManager.setupNotification()
+                }
+            } else {
                 callNotificationManager.setupNotification()
             }
-        } else {
-            callNotificationManager.setupNotification()
         }
     }