diff --git a/src/main/res/values-en/strings.xml b/src/main/res/values-en/strings.xml
index 8278064..b76057b 100644
--- a/src/main/res/values-en/strings.xml
+++ b/src/main/res/values-en/strings.xml
@@ -173,5 +173,6 @@
     <string name="error_connection_failed_not_found">Connection failed, the server returns 404 NOT FOUND. Ensure you set the correct path for your ownCloud instance.</string>
     <string name="nothing_to_sync">There is nothing to sync.</string>
     <string name="feature_not_already_implemented">This feature is not already implemented and will be available soon.</string>
+    <string name="pref_title_minimum_sync_chars">Minimum phonenumber length</string>
 
 </resources>
diff --git a/src/main/res/values-fr/strings.xml b/src/main/res/values-fr/strings.xml
index 4e0a3aa..4234097 100644
--- a/src/main/res/values-fr/strings.xml
+++ b/src/main/res/values-fr/strings.xml
@@ -160,4 +160,5 @@
     <string name="error_connection_failed_not_found">Echec de connexion, le serveur a retourné 404 NON TROUVE. Assurez vous d\'avoir spécifié la bonne URL.</string>
     <string name="nothing_to_sync">Il n\'y a rien à synchroniser.</string>
     <string name="feature_not_already_implemented">Cette fonctionnalité n\'est pas implémentée mais elle sera disponible bientôt.</string>
+    <string name="pref_title_minimum_sync_chars">Longueur minimale du numéro de téléphone</string>
 </resources>
diff --git a/src/main/res/values/strings.xml b/src/main/res/values/strings.xml
index 1b34580..69b5410 100644
--- a/src/main/res/values/strings.xml
+++ b/src/main/res/values/strings.xml
@@ -116,6 +116,43 @@
         <item>-1</item>
     </string-array>
 
+    <string-array name="pref_minimum_sync_chars_titles">
+        <item>0</item>
+        <item>1</item>
+        <item>2</item>
+        <item>3</item>
+        <item>4</item>
+        <item>5</item>
+        <item>6</item>
+        <item>7</item>
+        <item>8</item>
+        <item>9</item>
+        <item>10</item>
+        <item>11</item>
+        <item>12</item>
+        <item>13</item>
+        <item>14</item>
+        <item>15</item>
+    </string-array>
+    <string-array name="pref_minimum_sync_chars">
+        <item>0</item>
+        <item>1</item>
+        <item>2</item>
+        <item>3</item>
+        <item>4</item>
+        <item>5</item>
+        <item>6</item>
+        <item>7</item>
+        <item>8</item>
+        <item>9</item>
+        <item>10</item>
+        <item>11</item>
+        <item>12</item>
+        <item>13</item>
+        <item>14</item>
+        <item>15</item>
+    </string-array>
+
     <string name="pref_push_on_receive">Push SMS on reception</string>
     <string name="pref_sync_wifi">Synchronize in Wi-Fi</string>
     <string name="pref_sync_4g">Synchronize in 4G</string>
@@ -208,4 +245,5 @@
     <string name="error_connection_failed_not_found">Connection failed, the server returns 404 NOT FOUND. Ensure you set the correct path for your ownCloud instance.</string>
     <string name="nothing_to_sync">There is nothing to sync.</string>
     <string name="feature_not_already_implemented">This feature is not already implemented and will be available soon.</string>
+    <string name="pref_title_minimum_sync_chars">Minimum phonenumber length</string>
 </resources>
diff --git a/src/main/res/xml/pref_data_sync.xml b/src/main/res/xml/pref_data_sync.xml
index 2789683..6671736 100644
--- a/src/main/res/xml/pref_data_sync.xml
+++ b/src/main/res/xml/pref_data_sync.xml
@@ -17,6 +17,14 @@
         android:negativeButtonText="@null"
         android:positiveButtonText="@null"
         android:title="@string/pref_title_bulk_messages" />
+    <ListPreference
+        android:defaultValue="0"
+        android:entries="@array/pref_minimum_sync_chars_titles"
+        android:entryValues="@array/pref_minimum_sync_chars"
+        android:key="minimum_sync_chars"
+        android:negativeButtonText="@null"
+        android:positiveButtonText="@null"
+        android:title="@string/pref_title_minimum_sync_chars" />
     <CheckBoxPreference android:id="@+id/checkbox_push_on_receive"
         android:defaultValue="true"
         android:layout_width="wrap_content"