diff --git a/app/src/main/java/org/linphone/activities/main/contact/viewmodels/ContactsListViewModel.kt b/app/src/main/java/org/linphone/activities/main/contact/viewmodels/ContactsListViewModel.kt
index 1d02e5bd1..80926d131 100644
--- a/app/src/main/java/org/linphone/activities/main/contact/viewmodels/ContactsListViewModel.kt
+++ b/app/src/main/java/org/linphone/activities/main/contact/viewmodels/ContactsListViewModel.kt
@@ -56,20 +56,25 @@ class ContactsListViewModel : ViewModel() {
         super.onCleared()
     }
 
-    fun updateContactsList() {
-        var list = arrayListOf<Contact>()
-        list.addAll(if (sipContactsSelected.value == true) coreContext.contactsManager.sipContacts else coreContext.contactsManager.contacts)
+    private fun getContactsList(): ArrayList<Contact> {
+        return if (sipContactsSelected.value == true) coreContext.contactsManager.sipContacts else coreContext.contactsManager.contacts
+    }
 
-        val filterValue = filter.value.orEmpty().toLowerCase(Locale.getDefault())
-        if (filterValue.isNotEmpty()) {
-            list = list.filter { contact ->
-                contact.fullName?.toLowerCase(Locale.getDefault())?.contains(filterValue) ?: false
+    fun updateContactsList() {
+        val list: ArrayList<Contact>
+
+        val filterValue = filter.value.orEmpty()
+        list = if (filterValue.isNotEmpty()) {
+            getContactsList().filter { contact ->
+                contact.fullName?.contains(filterValue, true) ?: false
             } as ArrayList<Contact>
+        } else {
+            getContactsList()
         }
 
         // Prevent blinking items when list hasn't changed
         if (list.isEmpty() || list.size != contactsList.value.orEmpty().size) {
-            contactsList.value = list
+            contactsList.postValue(list)
         }
     }
 
diff --git a/app/src/main/java/org/linphone/contact/Contact.kt b/app/src/main/java/org/linphone/contact/Contact.kt
index a4778f5e4..e917f2b66 100644
--- a/app/src/main/java/org/linphone/contact/Contact.kt
+++ b/app/src/main/java/org/linphone/contact/Contact.kt
@@ -24,7 +24,6 @@ import android.graphics.Bitmap
 import android.net.Uri
 import androidx.core.app.Person
 import androidx.core.graphics.drawable.IconCompat
-import java.text.Collator
 import org.linphone.LinphoneApplication.Companion.coreContext
 import org.linphone.R
 import org.linphone.core.Address
@@ -57,6 +56,7 @@ open class Contact : Comparable<Contact> {
     override fun compareTo(other: Contact): Int {
         val fn = fullName ?: ""
         val otherFn = other.fullName ?: ""
+
         if (fn == otherFn) {
             if (phoneNumbers.size == other.phoneNumbers.size && phoneNumbers.size > 0) {
                 if (phoneNumbers != other.phoneNumbers) {
@@ -84,9 +84,8 @@ open class Contact : Comparable<Contact> {
             val otherOrg = other.organization ?: ""
             return org.compareTo(otherOrg)
         }
-        val collator = Collator.getInstance()
-        collator.strength = Collator.NO_DECOMPOSITION
-        return collator.compare(fn, otherFn)
+
+        return coreContext.collator.compare(fn, otherFn)
     }
 
     @Synchronized
diff --git a/app/src/main/java/org/linphone/core/CoreContext.kt b/app/src/main/java/org/linphone/core/CoreContext.kt
index 6bf079662..22b78b332 100644
--- a/app/src/main/java/org/linphone/core/CoreContext.kt
+++ b/app/src/main/java/org/linphone/core/CoreContext.kt
@@ -41,6 +41,7 @@ import java.math.BigInteger
 import java.nio.charset.StandardCharsets
 import java.security.KeyStore
 import java.security.MessageDigest
+import java.text.Collator
 import java.util.*
 import javax.crypto.Cipher
 import javax.crypto.KeyGenerator
@@ -84,6 +85,7 @@ class CoreContext(val context: Context, coreConfig: Config) {
         "$sdkVersion ($sdkBranch, $sdkBuildType)"
     }
 
+    val collator = Collator.getInstance()
     val contactsManager: ContactsManager by lazy {
         ContactsManager(context)
     }
@@ -308,6 +310,7 @@ class CoreContext(val context: Context, coreConfig: Config) {
         telephonyManager.listen(phoneStateListener, PhoneStateListener.LISTEN_CALL_STATE)
 
         EmojiCompat.init(BundledEmojiCompatConfig(context))
+        collator.strength = Collator.NO_DECOMPOSITION
     }
 
     fun stop() {