diff --git a/vector/src/debug/AndroidManifest.xml b/vector/src/debug/AndroidManifest.xml
index 8ffcec6bc1..dba8440602 100644
--- a/vector/src/debug/AndroidManifest.xml
+++ b/vector/src/debug/AndroidManifest.xml
@@ -5,6 +5,7 @@
     <application>
         <activity android:name=".features.debug.TestLinkifyActivity" />
         <activity android:name=".features.debug.DebugPermissionActivity" />
+        <activity android:name=".features.debug.settings.DebugPrivateSettingsActivity" />
         <activity android:name=".features.debug.sas.DebugSasEmojiActivity" />
     </application>
 
diff --git a/vector/src/debug/java/im/vector/app/features/debug/DebugMenuActivity.kt b/vector/src/debug/java/im/vector/app/features/debug/DebugMenuActivity.kt
index 960994b169..64de648a23 100644
--- a/vector/src/debug/java/im/vector/app/features/debug/DebugMenuActivity.kt
+++ b/vector/src/debug/java/im/vector/app/features/debug/DebugMenuActivity.kt
@@ -35,6 +35,7 @@ import im.vector.app.core.utils.registerForPermissionsResult
 import im.vector.app.core.utils.toast
 import im.vector.app.databinding.ActivityDebugMenuBinding
 import im.vector.app.features.debug.sas.DebugSasEmojiActivity
+import im.vector.app.features.debug.settings.DebugPrivateSettingsActivity
 import im.vector.app.features.qrcode.QrCodeScannerActivity
 import im.vector.lib.ui.styles.debug.DebugMaterialThemeDarkDefaultActivity
 import im.vector.lib.ui.styles.debug.DebugMaterialThemeDarkTestActivity
@@ -75,6 +76,7 @@ class DebugMenuActivity : VectorBaseActivity<ActivityDebugMenuBinding>() {
     }
 
     private fun setupViews() {
+        views.debugPrivateSetting.setOnClickListener { openPrivateSettings() }
         views.debugTestTextViewLink.setOnClickListener { testTextViewLink() }
         views.debugOpenButtonStylesLight.setOnClickListener {
             startActivity(Intent(this, DebugVectorButtonStylesLightActivity::class.java))
@@ -115,6 +117,10 @@ class DebugMenuActivity : VectorBaseActivity<ActivityDebugMenuBinding>() {
         }
     }
 
+    private fun openPrivateSettings() {
+        startActivity(Intent(this, DebugPrivateSettingsActivity::class.java))
+    }
+
     private fun renderQrCode(text: String) {
         views.debugQrCode.setData(text)
     }
diff --git a/vector/src/debug/java/im/vector/app/features/debug/settings/DebugPrivateSettingsActivity.kt b/vector/src/debug/java/im/vector/app/features/debug/settings/DebugPrivateSettingsActivity.kt
new file mode 100644
index 0000000000..ad2ac70646
--- /dev/null
+++ b/vector/src/debug/java/im/vector/app/features/debug/settings/DebugPrivateSettingsActivity.kt
@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2021 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.app.features.debug.settings
+
+import com.airbnb.mvrx.viewModel
+import com.airbnb.mvrx.withState
+import dagger.hilt.android.AndroidEntryPoint
+import im.vector.app.core.platform.VectorBaseActivity
+import im.vector.app.databinding.ActivityDebugPrivateSettingsBinding
+
+@AndroidEntryPoint
+class DebugPrivateSettingsActivity : VectorBaseActivity<ActivityDebugPrivateSettingsBinding>() {
+
+    private val viewModel: DebugPrivateSettingsViewModel by viewModel()
+
+    override fun getBinding() = ActivityDebugPrivateSettingsBinding.inflate(layoutInflater)
+
+    override fun initUiAndData() {
+        views.forceDialPadTabDisplay.setOnCheckedChangeListener { _, isChecked ->
+            viewModel.handle(DebugPrivateSettingsViewActions.SetDialPadVisibility(isChecked))
+        }
+    }
+
+    override fun invalidate() = withState(viewModel) {
+        views.forceDialPadTabDisplay.isChecked = it.dialPadVisible
+    }
+}
diff --git a/vector/src/debug/java/im/vector/app/features/debug/settings/DebugPrivateSettingsViewActions.kt b/vector/src/debug/java/im/vector/app/features/debug/settings/DebugPrivateSettingsViewActions.kt
new file mode 100644
index 0000000000..ecbb241387
--- /dev/null
+++ b/vector/src/debug/java/im/vector/app/features/debug/settings/DebugPrivateSettingsViewActions.kt
@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2021 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.app.features.debug.settings
+
+import im.vector.app.core.platform.VectorViewModelAction
+
+sealed class DebugPrivateSettingsViewActions : VectorViewModelAction {
+    data class SetDialPadVisibility(val force: Boolean) : DebugPrivateSettingsViewActions()
+}
diff --git a/vector/src/debug/java/im/vector/app/features/debug/settings/DebugPrivateSettingsViewModel.kt b/vector/src/debug/java/im/vector/app/features/debug/settings/DebugPrivateSettingsViewModel.kt
new file mode 100644
index 0000000000..f4ff4da163
--- /dev/null
+++ b/vector/src/debug/java/im/vector/app/features/debug/settings/DebugPrivateSettingsViewModel.kt
@@ -0,0 +1,68 @@
+/*
+ * Copyright (c) 2021 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.app.features.debug.settings
+
+import com.airbnb.mvrx.MavericksViewModelFactory
+import dagger.assisted.Assisted
+import dagger.assisted.AssistedFactory
+import dagger.assisted.AssistedInject
+import im.vector.app.core.di.MavericksAssistedViewModelFactory
+import im.vector.app.core.di.hiltMavericksViewModelFactory
+import im.vector.app.core.platform.EmptyViewEvents
+import im.vector.app.core.platform.VectorViewModel
+import im.vector.app.features.settings.VectorDataStore
+import kotlinx.coroutines.flow.onEach
+import kotlinx.coroutines.launch
+
+class DebugPrivateSettingsViewModel @AssistedInject constructor(
+        @Assisted initialState: DebugPrivateSettingsViewState,
+        private val vectorDataStore: VectorDataStore
+) : VectorViewModel<DebugPrivateSettingsViewState, DebugPrivateSettingsViewActions, EmptyViewEvents>(initialState) {
+
+    @AssistedFactory
+    interface Factory : MavericksAssistedViewModelFactory<DebugPrivateSettingsViewModel, DebugPrivateSettingsViewState> {
+        override fun create(initialState: DebugPrivateSettingsViewState): DebugPrivateSettingsViewModel
+    }
+
+    companion object : MavericksViewModelFactory<DebugPrivateSettingsViewModel, DebugPrivateSettingsViewState> by hiltMavericksViewModelFactory()
+
+    init {
+        observeVectorDataStore()
+    }
+
+    private fun observeVectorDataStore() {
+        vectorDataStore.forceDialPadDisplayFlow.onEach {
+            setState {
+                copy(
+                        dialPadVisible = it
+                )
+            }
+        }
+    }
+
+    override fun handle(action: DebugPrivateSettingsViewActions) {
+        when (action) {
+            is DebugPrivateSettingsViewActions.SetDialPadVisibility -> handleSetDialPadVisibility(action)
+        }
+    }
+
+    private fun handleSetDialPadVisibility(action: DebugPrivateSettingsViewActions.SetDialPadVisibility) {
+        viewModelScope.launch {
+            vectorDataStore.setForceDialPadDisplay(action.force)
+        }
+    }
+}
diff --git a/vector/src/debug/java/im/vector/app/features/debug/settings/DebugPrivateSettingsViewState.kt b/vector/src/debug/java/im/vector/app/features/debug/settings/DebugPrivateSettingsViewState.kt
new file mode 100644
index 0000000000..0ad4b185ec
--- /dev/null
+++ b/vector/src/debug/java/im/vector/app/features/debug/settings/DebugPrivateSettingsViewState.kt
@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2021 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.app.features.debug.settings
+
+import com.airbnb.mvrx.MavericksState
+
+data class DebugPrivateSettingsViewState(
+        val dialPadVisible: Boolean = false
+) : MavericksState
diff --git a/vector/src/debug/res/layout/activity_debug_menu.xml b/vector/src/debug/res/layout/activity_debug_menu.xml
index fadffecf83..ac70e4ef0e 100644
--- a/vector/src/debug/res/layout/activity_debug_menu.xml
+++ b/vector/src/debug/res/layout/activity_debug_menu.xml
@@ -20,6 +20,12 @@
             android:padding="@dimen/layout_horizontal_margin"
             android:showDividers="middle">
 
+            <Button
+                android:id="@+id/debug_private_setting"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text="Private settings" />
+
             <Button
                 android:id="@+id/debug_test_text_view_link"
                 android:layout_width="wrap_content"
diff --git a/vector/src/debug/res/layout/activity_debug_private_settings.xml b/vector/src/debug/res/layout/activity_debug_private_settings.xml
new file mode 100644
index 0000000000..b4186e7bba
--- /dev/null
+++ b/vector/src/debug/res/layout/activity_debug_private_settings.xml
@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/coordinatorLayout"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".features.debug.settings.DebugPrivateSettingsActivity"
+    tools:ignore="HardcodedText">
+
+    <ScrollView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content">
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:divider="@drawable/linear_divider"
+            android:orientation="vertical"
+            android:padding="@dimen/layout_horizontal_margin"
+            android:showDividers="middle">
+
+            <CheckBox
+                android:id="@+id/forceDialPadTabDisplay"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text="Force DialPad tab display" />
+
+        </LinearLayout>
+
+    </ScrollView>
+
+</androidx.coordinatorlayout.widget.CoordinatorLayout>
diff --git a/vector/src/main/java/im/vector/app/features/home/HomeDetailViewModel.kt b/vector/src/main/java/im/vector/app/features/home/HomeDetailViewModel.kt
index af7eea205f..84fd8e06ee 100644
--- a/vector/src/main/java/im/vector/app/features/home/HomeDetailViewModel.kt
+++ b/vector/src/main/java/im/vector/app/features/home/HomeDetailViewModel.kt
@@ -101,6 +101,8 @@ class HomeDetailViewModel @AssistedInject constructor(
         }
     }
 
+    private var forceDialPad = false
+
     private fun observeDataStore() {
         viewModelScope.launch {
             vectorDataStore.pushCounterFlow.collect { nbOfPush ->
@@ -110,6 +112,10 @@ class HomeDetailViewModel @AssistedInject constructor(
                     )
                 }
             }
+            vectorDataStore.forceDialPadDisplayFlow.collect { force ->
+                forceDialPad = force
+                updateShowDialPadTab()
+            }
         }
     }
 
@@ -156,7 +162,7 @@ class HomeDetailViewModel @AssistedInject constructor(
 
     private fun updateShowDialPadTab() {
         setState {
-            copy(showDialPadTab = callManager.supportsPSTNProtocol)
+            copy(showDialPadTab = forceDialPad || callManager.supportsPSTNProtocol)
         }
     }
 
diff --git a/vector/src/main/java/im/vector/app/features/settings/VectorDataStore.kt b/vector/src/main/java/im/vector/app/features/settings/VectorDataStore.kt
index 74b3794b2c..6a5ef0ac99 100644
--- a/vector/src/main/java/im/vector/app/features/settings/VectorDataStore.kt
+++ b/vector/src/main/java/im/vector/app/features/settings/VectorDataStore.kt
@@ -19,11 +19,13 @@ package im.vector.app.features.settings
 import android.content.Context
 import androidx.datastore.core.DataStore
 import androidx.datastore.preferences.core.Preferences
+import androidx.datastore.preferences.core.booleanPreferencesKey
 import androidx.datastore.preferences.core.edit
 import androidx.datastore.preferences.core.intPreferencesKey
 import androidx.datastore.preferences.preferencesDataStore
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.map
+import org.matrix.android.sdk.api.extensions.orFalse
 import javax.inject.Inject
 
 private val Context.dataStore: DataStore<Preferences> by preferencesDataStore(name = "vector_settings")
@@ -44,4 +46,17 @@ class VectorDataStore @Inject constructor(
             settings[pushCounter] = currentCounterValue + 1
         }
     }
+
+    // For debug only
+    private val forceDialPadDisplay = booleanPreferencesKey("force_dial_pad_display")
+
+    val forceDialPadDisplayFlow: Flow<Boolean> = context.dataStore.data.map { preferences ->
+        preferences[forceDialPadDisplay].orFalse()
+    }
+
+    suspend fun setForceDialPadDisplay(force: Boolean) {
+        context.dataStore.edit { settings ->
+            settings[forceDialPadDisplay] = force
+        }
+    }
 }