diff --git a/app/src/main/kotlin/com/simplemobiletools/smsmessenger/activities/ThreadActivity.kt b/app/src/main/kotlin/com/simplemobiletools/smsmessenger/activities/ThreadActivity.kt
index 163efec9..479d531e 100644
--- a/app/src/main/kotlin/com/simplemobiletools/smsmessenger/activities/ThreadActivity.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/smsmessenger/activities/ThreadActivity.kt
@@ -370,16 +370,24 @@ class ThreadActivity : SimpleActivity() {
         showSelectedContacts()
     }
 
+    @SuppressLint("MissingPermission")
     private fun getThreadItems(): ArrayList<ThreadItem> {
         messages.sortBy { it.date }
 
+        val subscriptionIdToSimId = HashMap<Int, String>()
+        subscriptionIdToSimId[-1] = "?"
+        SubscriptionManager.from(this).activeSubscriptionInfoList.forEachIndexed { index, subscriptionInfo ->
+            subscriptionIdToSimId[subscriptionInfo.subscriptionId] = "${index + 1}"
+        }
+
         val items = ArrayList<ThreadItem>()
         var prevDateTime = 0
         var hadUnreadItems = false
         messages.forEach {
             // do not show the date/time above every message, only if the difference between the 2 messages is at least MIN_DATE_TIME_DIFF_SECS
             if (it.date - prevDateTime > MIN_DATE_TIME_DIFF_SECS) {
-                items.add(ThreadDateTime(it.date))
+                val simCardID = subscriptionIdToSimId[it.subscriptionId] ?: "?"
+                items.add(ThreadDateTime(it.date, simCardID))
                 prevDateTime = it.date
             }
             items.add(it)
diff --git a/app/src/main/kotlin/com/simplemobiletools/smsmessenger/adapters/ThreadAdapter.kt b/app/src/main/kotlin/com/simplemobiletools/smsmessenger/adapters/ThreadAdapter.kt
index 0a609b19..7eb239b1 100644
--- a/app/src/main/kotlin/com/simplemobiletools/smsmessenger/adapters/ThreadAdapter.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/smsmessenger/adapters/ThreadAdapter.kt
@@ -3,6 +3,7 @@ package com.simplemobiletools.smsmessenger.adapters
 import android.content.Intent
 import android.graphics.drawable.Drawable
 import android.net.Uri
+import android.telephony.SubscriptionManager
 import android.view.Menu
 import android.view.View
 import android.view.ViewGroup
@@ -42,6 +43,7 @@ class ThreadAdapter(activity: SimpleActivity, var messages: ArrayList<ThreadItem
                     itemClick: (Any) -> Unit) : MyRecyclerViewAdapter(activity, recyclerView, fastScroller, itemClick) {
 
     private val roundedCornersRadius = resources.getDimension(R.dimen.normal_margin).toInt()
+    private val hasMultipleSIMCards = SubscriptionManager.from(activity).activeSubscriptionInfoList.size > 1
 
     init {
         setupDragListener(true)
@@ -283,6 +285,14 @@ class ThreadAdapter(activity: SimpleActivity, var messages: ArrayList<ThreadItem
         view.apply {
             thread_date_time.text = dateTime.date.formatDateOrTime(context, false)
             thread_date_time.setTextColor(textColor)
+
+            thread_sim_icon.beVisibleIf(hasMultipleSIMCards)
+            thread_sim_number.beVisibleIf(hasMultipleSIMCards)
+            if (hasMultipleSIMCards) {
+                thread_sim_number.text = dateTime.simID
+                thread_sim_number.setTextColor(textColor.getContrastColor())
+                thread_sim_icon.applyColorFilter(textColor)
+            }
         }
     }
 }
diff --git a/app/src/main/kotlin/com/simplemobiletools/smsmessenger/models/ThreadDateTime.kt b/app/src/main/kotlin/com/simplemobiletools/smsmessenger/models/ThreadDateTime.kt
index 7b2d9293..d69d81fa 100644
--- a/app/src/main/kotlin/com/simplemobiletools/smsmessenger/models/ThreadDateTime.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/smsmessenger/models/ThreadDateTime.kt
@@ -1,3 +1,3 @@
 package com.simplemobiletools.smsmessenger.models
 
-open class ThreadDateTime(val date: Int) : ThreadItem()
+open class ThreadDateTime(val date: Int, val simID: String) : ThreadItem()
diff --git a/app/src/main/res/layout/item_thread_date_time.xml b/app/src/main/res/layout/item_thread_date_time.xml
index 5f93edcf..413c3ef8 100644
--- a/app/src/main/res/layout/item_thread_date_time.xml
+++ b/app/src/main/res/layout/item_thread_date_time.xml
@@ -1,10 +1,40 @@
 <?xml version="1.0" encoding="utf-8"?>
-<TextView xmlns:android="http://schemas.android.com/apk/res/android"
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
-    android:id="@+id/thread_date_time"
+    android:id="@+id/thread_date_time_holder"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
-    android:layout_marginTop="@dimen/normal_margin"
-    android:gravity="center_horizontal"
-    android:textSize="@dimen/normal_text_size"
-    tools:text="13 March, 13:30" />
+    android:layout_marginTop="@dimen/medium_margin">
+
+    <TextView
+        android:id="@+id/thread_date_time"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_centerHorizontal="true"
+        android:textSize="@dimen/normal_text_size"
+        tools:text="13 March, 13:30" />
+
+    <ImageView
+        android:id="@+id/thread_sim_icon"
+        android:layout_width="@dimen/activity_margin"
+        android:layout_height="wrap_content"
+        android:layout_alignTop="@+id/thread_date_time"
+        android:layout_alignBottom="@id/thread_date_time"
+        android:layout_marginEnd="@dimen/small_margin"
+        android:layout_toStartOf="@id/thread_date_time"
+        android:src="@drawable/ic_sim_vector" />
+
+    <TextView
+        android:id="@+id/thread_sim_number"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:layout_alignStart="@+id/thread_sim_icon"
+        android:layout_alignTop="@+id/thread_sim_icon"
+        android:layout_alignEnd="@+id/thread_sim_icon"
+        android:layout_alignBottom="@+id/thread_sim_icon"
+        android:gravity="center"
+        android:textColor="@color/md_grey_black"
+        android:textSize="@dimen/smaller_text_size"
+        tools:text="1" />
+
+</RelativeLayout>