diff --git a/td/telegram/ConfigManager.cpp b/td/telegram/ConfigManager.cpp
index cd496d1ec..7921ab8be 100644
--- a/td/telegram/ConfigManager.cpp
+++ b/td/telegram/ConfigManager.cpp
@@ -13,6 +13,7 @@
 #include "td/telegram/LinkManager.h"
 #include "td/telegram/logevent/LogEvent.h"
 #include "td/telegram/MessageReaction.h"
+#include "td/telegram/misc.h"
 #include "td/telegram/net/AuthDataShared.h"
 #include "td/telegram/net/ConnectionCreator.h"
 #include "td/telegram/net/DcId.h"
@@ -1493,6 +1494,7 @@ void ConfigManager::process_app_config(tl_object_ptr<telegram_api::JSONValue> &c
   int32 stickers_normal_by_emoji_per_premium_num = 2;
   int32 forum_upgrade_participants_min = 200;
   int32 telegram_antispam_group_size_min = 100;
+  vector<string> fragment_prefixes;
   if (config->get_id() == telegram_api::jsonObject::ID) {
     for (auto &key_value : static_cast<telegram_api::jsonObject *>(config.get())->value_) {
       Slice key = key_value->key_;
@@ -1858,6 +1860,23 @@ void ConfigManager::process_app_config(tl_object_ptr<telegram_api::JSONValue> &c
         telegram_antispam_group_size_min = get_json_value_int(std::move(key_value->value_), key);
         continue;
       }
+      if (key == "fragment_prefixes") {
+        if (value->get_id() == telegram_api::jsonArray::ID) {
+          auto prefixes = std::move(static_cast<telegram_api::jsonArray *>(value)->value_);
+          for (auto &prefix : prefixes) {
+            auto prefix_text = get_json_value_string(std::move(prefix), key);
+            clean_phone_number(prefix_text);
+            if (!prefix_text.empty()) {
+              fragment_prefixes.push_back(prefix_text);
+            } else {
+              LOG(ERROR) << "Receive an invalid Fragment prefix";
+            }
+          }
+        } else {
+          LOG(ERROR) << "Receive unexpected fragment_prefixes " << to_string(*value);
+        }
+        continue;
+      }
 
       new_values.push_back(std::move(key_value));
     }
@@ -1906,6 +1925,8 @@ void ConfigManager::process_app_config(tl_object_ptr<telegram_api::JSONValue> &c
     options.set_option_string("dice_emojis", implode(dice_emojis, '\x01'));
   }
 
+  options.set_option_string("fragment_prefixes", implode(fragment_prefixes, ','));
+
   options.set_option_string("emoji_sounds", implode(emoji_sounds, ','));
 
   if (animated_emoji_zoom <= 0 || animated_emoji_zoom > 2.0) {
diff --git a/td/telegram/ContactsManager.cpp b/td/telegram/ContactsManager.cpp
index f672aeb05..cdad38487 100644
--- a/td/telegram/ContactsManager.cpp
+++ b/td/telegram/ContactsManager.cpp
@@ -3791,6 +3791,8 @@ void ContactsManager::start_up() {
   if (!pending_location_visibility_expire_date_) {
     try_send_set_location_visibility_query();
   }
+
+  on_update_fragment_prefixes();
 }
 
 void ContactsManager::tear_down() {
@@ -16888,6 +16890,22 @@ void ContactsManager::on_update_channel_administrator_count(ChannelId channel_id
   }
 }
 
+void ContactsManager::on_update_fragment_prefixes() {
+  if (G()->close_flag()) {
+    return;
+  }
+  if (td_->auth_manager_->is_bot()) {
+    return;
+  }
+
+  auto fragment_prefixes_str = td_->option_manager_->get_option_string("fragment_prefixes", "888");
+  if (fragment_prefixes_str == fragment_prefixes_str_) {
+    return;
+  }
+  fragment_prefixes_str_ = std::move(fragment_prefixes_str);
+  fragment_prefixes_ = full_split(fragment_prefixes_str_, ',');
+}
+
 void ContactsManager::on_update_dialog_administrators(DialogId dialog_id, vector<DialogAdministrator> &&administrators,
                                                       bool have_access, bool from_database) {
   LOG(INFO) << "Update administrators in " << dialog_id << " to " << format::as_array(administrators);
diff --git a/td/telegram/ContactsManager.h b/td/telegram/ContactsManager.h
index b95706629..277363658 100644
--- a/td/telegram/ContactsManager.h
+++ b/td/telegram/ContactsManager.h
@@ -233,6 +233,8 @@ class ContactsManager final : public Actor {
 
   void on_update_bot_menu_button(UserId bot_user_id, tl_object_ptr<telegram_api::BotMenuButton> &&bot_menu_button);
 
+  void on_update_fragment_prefixes();
+
   void on_update_dialog_administrators(DialogId dialog_id, vector<DialogAdministrator> &&administrators,
                                        bool have_access, bool from_database);
 
@@ -1930,6 +1932,9 @@ class ContactsManager final : public Actor {
   vector<UserId> imported_contact_user_ids_;  // result of change_imported_contacts
   vector<int32> unimported_contact_invites_;  // result of change_imported_contacts
 
+  string fragment_prefixes_str_;
+  vector<string> fragment_prefixes_;
+
   MultiTimeout user_online_timeout_{"UserOnlineTimeout"};
   MultiTimeout user_emoji_status_timeout_{"UserEmojiStatusTimeout"};
   MultiTimeout channel_unban_timeout_{"ChannelUnbanTimeout"};
diff --git a/td/telegram/OptionManager.cpp b/td/telegram/OptionManager.cpp
index 9946b9c8a..bb38ba8ff 100644
--- a/td/telegram/OptionManager.cpp
+++ b/td/telegram/OptionManager.cpp
@@ -264,6 +264,8 @@ bool OptionManager::is_internal_option(Slice name) {
              name == "dice_emojis" || name == "dice_success_values";
     case 'e':
       return name == "edit_time_limit" || name == "emoji_sounds";
+    case 'f':
+      return name == "fragment_prefixes";
     case 'i':
       return name == "ignored_restriction_reasons";
     case 'l':
@@ -360,6 +362,9 @@ void OptionManager::on_option_updated(Slice name) {
       if (name == "favorite_stickers_limit") {
         td_->stickers_manager_->on_update_favorite_stickers_limit();
       }
+      if (name == "fragment_prefixes") {
+        send_closure(td_->contacts_manager_actor_, &ContactsManager::on_update_fragment_prefixes);
+      }
       break;
     case 'i':
       if (name == "ignored_restriction_reasons") {