diff --git a/app/src/main/kotlin/com/simplemobiletools/dialer/App.kt b/app/src/main/kotlin/com/simplemobiletools/dialer/App.kt
index 4f23dada..410409f2 100644
--- a/app/src/main/kotlin/com/simplemobiletools/dialer/App.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/dialer/App.kt
@@ -2,8 +2,10 @@ package com.simplemobiletools.dialer
 
 import android.app.Application
 import com.simplemobiletools.commons.extensions.checkUseEnglish
+import com.simplemobiletools.dialer.helpers.CallDurationHelper
 
 class App : Application() {
+    val callDurationHelper by lazy { CallDurationHelper() }
     override fun onCreate() {
         super.onCreate()
         checkUseEnglish()
diff --git a/app/src/main/kotlin/com/simplemobiletools/dialer/activities/CallActivity.kt b/app/src/main/kotlin/com/simplemobiletools/dialer/activities/CallActivity.kt
index 5d8b4a21..4d6b3657 100644
--- a/app/src/main/kotlin/com/simplemobiletools/dialer/activities/CallActivity.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/dialer/activities/CallActivity.kt
@@ -16,6 +16,7 @@ import com.simplemobiletools.commons.extensions.*
 import com.simplemobiletools.commons.helpers.MINUTE_SECONDS
 import com.simplemobiletools.commons.helpers.isOreoMr1Plus
 import com.simplemobiletools.commons.helpers.isOreoPlus
+import com.simplemobiletools.dialer.App
 import com.simplemobiletools.dialer.R
 import com.simplemobiletools.dialer.extensions.addCharacter
 import com.simplemobiletools.dialer.extensions.audioManager
@@ -24,8 +25,6 @@ import com.simplemobiletools.dialer.extensions.getHandleToUse
 import com.simplemobiletools.dialer.helpers.CallContactAvatarHelper
 import com.simplemobiletools.dialer.helpers.CallManager
 import com.simplemobiletools.dialer.models.CallContact
-import java.util.Timer
-import java.util.TimerTask
 import kotlinx.android.synthetic.main.activity_call.*
 import kotlinx.android.synthetic.main.dialpad.*
 
@@ -41,11 +40,11 @@ class CallActivity : SimpleActivity() {
     private var isSpeakerOn = false
     private var isMicrophoneOn = true
     private var isCallEnded = false
-    private var callDuration = 0
     private var callContact: CallContact? = null
     private var proximityWakeLock: PowerManager.WakeLock? = null
-    private var callTimer = Timer()
+    private var callDuration = 0
     private val callContactAvatarHelper by lazy { CallContactAvatarHelper(this) }
+    private val callDurationHelper by lazy {  (application as App).callDurationHelper }
 
     override fun onCreate(savedInstanceState: Bundle?) {
         supportActionBar?.hide()
@@ -75,7 +74,6 @@ class CallActivity : SimpleActivity() {
     override fun onDestroy() {
         super.onDestroy()
         CallManager.unregisterCallback(callCallback)
-        callTimer.cancel()
         if (proximityWakeLock?.isHeld == true) {
             proximityWakeLock!!.release()
         }
@@ -221,10 +219,6 @@ class CallActivity : SimpleActivity() {
             Call.STATE_SELECT_PHONE_ACCOUNT -> showPhoneAccountPicker()
         }
 
-        if (state == Call.STATE_DISCONNECTED || state == Call.STATE_DISCONNECTING) {
-            callTimer.cancel()
-        }
-
         val statusTextId = when (state) {
             Call.STATE_RINGING -> R.string.is_calling
             Call.STATE_DIALING -> R.string.dialing
@@ -254,9 +248,13 @@ class CallActivity : SimpleActivity() {
         initProximitySensor()
         incoming_call_holder.beGone()
         ongoing_call_holder.beVisible()
-        try {
-            callTimer.scheduleAtFixedRate(getCallTimerUpdateTask(), 1000, 1000)
-        } catch (ignored: Exception) {
+        callDurationHelper.onDurationChange {
+            callDuration = it
+            runOnUiThread {
+                if (!isCallEnded) {
+                    call_status_label.text = callDuration.getFormattedDuration()
+                }
+            }
         }
     }
 
@@ -298,17 +296,6 @@ class CallActivity : SimpleActivity() {
         }
     }
 
-    private fun getCallTimerUpdateTask() = object : TimerTask() {
-        override fun run() {
-            callDuration++
-            runOnUiThread {
-                if (!isCallEnded) {
-                    call_status_label.text = callDuration.getFormattedDuration()
-                }
-            }
-        }
-    }
-
     private val callCallback = object : Call.Callback() {
         override fun onStateChanged(call: Call, state: Int) {
             super.onStateChanged(call, state)
diff --git a/app/src/main/kotlin/com/simplemobiletools/dialer/helpers/CallDurationHelper.kt b/app/src/main/kotlin/com/simplemobiletools/dialer/helpers/CallDurationHelper.kt
new file mode 100644
index 00000000..6f8e1559
--- /dev/null
+++ b/app/src/main/kotlin/com/simplemobiletools/dialer/helpers/CallDurationHelper.kt
@@ -0,0 +1,32 @@
+package com.simplemobiletools.dialer.helpers
+
+import java.util.Timer
+import java.util.TimerTask
+
+class CallDurationHelper {
+    private var callTimer = Timer()
+    private var callDuration = 0
+    private var callback: ((durationSecs: Int) -> Unit)? = null
+
+    fun onDurationChange(callback: (durationSecs: Int) -> Unit) {
+        this.callback = callback
+    }
+
+    fun start() {
+        try {
+            callTimer.scheduleAtFixedRate(getTimerUpdateTask(), 1000, 1000)
+        } catch (ignored: Exception) {
+        }
+    }
+
+    fun cancel() {
+        callTimer.cancel()
+    }
+
+    private fun getTimerUpdateTask() = object : TimerTask() {
+        override fun run() {
+            callDuration++
+            callback?.invoke(callDuration)
+        }
+    }
+}
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 0896ae28..e72d8c41 100644
--- a/app/src/main/kotlin/com/simplemobiletools/dialer/services/CallService.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/dialer/services/CallService.kt
@@ -2,16 +2,24 @@ package com.simplemobiletools.dialer.services
 
 import android.telecom.Call
 import android.telecom.InCallService
+import com.simplemobiletools.dialer.App
 import com.simplemobiletools.dialer.activities.CallActivity
 import com.simplemobiletools.dialer.helpers.CallManager
 import com.simplemobiletools.dialer.helpers.CallNotificationManager
 
 class CallService : InCallService() {
     private val callNotificationManager by lazy { CallNotificationManager(this) }
+    private val callDurationHelper by lazy {  (application as App).callDurationHelper }
+
     private val callListener = object : Call.Callback() {
         override fun onStateChanged(call: Call, state: Int) {
             super.onStateChanged(call, state)
             callNotificationManager.setupNotification()
+            if (state == Call.STATE_ACTIVE) {
+                callDurationHelper.start()
+            }else if (state == Call.STATE_DISCONNECTED || state == Call.STATE_DISCONNECTING) {
+                callDurationHelper.cancel()
+            }
         }
     }
 
@@ -35,5 +43,6 @@ class CallService : InCallService() {
         super.onDestroy()
         CallManager.registerCallback(callListener)
         callNotificationManager.cancelNotification()
+        callDurationHelper.cancel()
     }
 }