diff --git a/telethon/telegram_client.py b/telethon/telegram_client.py
index c638c2b1..59bf4a9a 100644
--- a/telethon/telegram_client.py
+++ b/telethon/telegram_client.py
@@ -23,7 +23,7 @@ from .tl.functions.account import (
 )
 from .tl.functions.auth import (
     CheckPasswordRequest, LogOutRequest, SendCodeRequest, SignInRequest,
-    SignUpRequest, ImportBotAuthorizationRequest
+    SignUpRequest, ResendCodeRequest, ImportBotAuthorizationRequest
 )
 from .tl.functions.contacts import (
     GetContactsRequest, ResolveUsernameRequest
@@ -129,16 +129,29 @@ class TelegramClient(TelegramBareClient):
 
     # region Authorization requests
 
-    def send_code_request(self, phone):
+    def send_code_request(self, phone, force_sms=False):
         """Sends a code request to the specified phone number.
 
-        :param str | int phone: The phone to which the code will be sent.
-        :return auth.SentCode: Information about the result of the request.
+        :param str | int phone:
+            The phone to which the code will be sent.
+        :param bool force_sms:
+            Whether to force sending as SMS. You should call it at least
+            once before without this set to True first.
+        :return auth.SentCode:
+            Information about the result of the request.
         """
         phone = EntityDatabase.parse_phone(phone) or self._phone
-        result = self(SendCodeRequest(phone, self.api_id, self.api_hash))
+        if force_sms:
+            if not self._phone_code_hash:
+                raise ValueError(
+                    'You must call this method without force_sms at least once.'
+                )
+            result = self(ResendCodeRequest(phone, self._phone_code_hash))
+        else:
+            result = self(SendCodeRequest(phone, self.api_id, self.api_hash))
+            self._phone_code_hash = result.phone_code_hash
+
         self._phone = phone
-        self._phone_code_hash = result.phone_code_hash
         return result
 
     def sign_in(self, phone=None, code=None,