diff --git a/.env.example b/.env.example
index a1757c3..62125ae 100644
--- a/.env.example
+++ b/.env.example
@@ -11,9 +11,11 @@ OTP_TTL_SECONDS=120
 OTP_MAX_ATTEMPTS=5
 OTP_REQUEST_LIMIT=3
 OTP_REQUEST_WINDOW_SECONDS=300
+SMS_PROVIDER=kavenegar
 KAVENEGAR_API_KEY=replace-with-real-key
 KAVENEGAR_LOGIN_TEMPLATE=login-otp
+SMS_IR_API_KEY=replace-with-real-key
+SMS_IR_VERIFY_TEMPLATE_ID=570574
 ADMIN_MOBILE=989120000000
 GRPC_HOST=0.0.0.0
 GRPC_PORT=50051
-
diff --git a/README.md b/README.md
index 61542ae..832c81f 100644
--- a/README.md
+++ b/README.md
@@ -1,11 +1,11 @@
 # Gapido Backend Code Challenge
 
-Python gRPC OTP authentication service with MongoDB, Redis, RabbitMQ, and a Kavenegar SMS adapter.
+Python gRPC OTP authentication service with MongoDB, Redis, RabbitMQ, and selectable SMS providers.
 
 ## Architecture
 
 - `auth-service`: async `grpc.aio` API for OTP login, token refresh, token revocation, and RBAC demo methods.
-- `sms-worker`: RabbitMQ consumer that sends OTP messages through Kavenegar.
+- `sms-worker`: RabbitMQ consumer that sends OTP messages through the configured SMS provider.
 - MongoDB stores users and refresh-token sessions.
 - Redis stores OTP hashes, TTL, verification attempts, and OTP request rate limits.
 - RabbitMQ decouples authentication from SMS delivery.
@@ -19,6 +19,19 @@ docker compose up --build
 
 The gRPC service listens on `localhost:50051`. RabbitMQ management is available at `http://localhost:15672` with `guest` / `guest`.
 
+## SMS Provider
+
+The SMS integration uses the Strategy pattern behind the `SmsClient` port. Select the provider with:
+
+```env
+SMS_PROVIDER=kavenegar
+```
+
+Supported values:
+
+- `kavenegar`: uses `KAVENEGAR_API_KEY` and `KAVENEGAR_LOGIN_TEMPLATE`.
+- `sms_ir`: uses `SMS_IR_API_KEY` and `SMS_IR_VERIFY_TEMPLATE_ID`.
+
 ## Local Development
 
 ```bash
@@ -50,5 +63,4 @@ authorization: Bearer <access_token>
 - OTP requests are rate-limited per mobile number and client identity.
 - Refresh tokens are opaque random values; only SHA-256 hashes are persisted.
 - Refresh tokens rotate on use.
-- Kavenegar is hidden behind an adapter and mocked in tests.
-
+- SMS providers are hidden behind adapters and mocked in tests.
diff --git a/docker-compose.yml b/docker-compose.yml
index 36b7839..b1536c1 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -15,7 +15,9 @@ services:
       OTP_MAX_ATTEMPTS: ${OTP_MAX_ATTEMPTS:-5}
       OTP_REQUEST_LIMIT: ${OTP_REQUEST_LIMIT:-3}
       OTP_REQUEST_WINDOW_SECONDS: ${OTP_REQUEST_WINDOW_SECONDS:-300}
+      SMS_PROVIDER: ${SMS_PROVIDER:-kavenegar}
       KAVENEGAR_LOGIN_TEMPLATE: ${KAVENEGAR_LOGIN_TEMPLATE:-login-otp}
+      SMS_IR_VERIFY_TEMPLATE_ID: ${SMS_IR_VERIFY_TEMPLATE_ID:-570574}
       ADMIN_MOBILE: ${ADMIN_MOBILE:-989120000000}
       GRPC_HOST: 0.0.0.0
       GRPC_PORT: 50051
@@ -36,7 +38,9 @@ services:
       MONGO_URI: mongodb://mongo:27017
       REDIS_URL: redis://redis:6379/0
       RABBITMQ_URL: amqp://guest:guest@rabbitmq:5672/
+      SMS_PROVIDER: ${SMS_PROVIDER:-kavenegar}
       KAVENEGAR_API_KEY: ${KAVENEGAR_API_KEY:-replace-with-real-key}
+      SMS_IR_API_KEY: ${SMS_IR_API_KEY:-replace-with-real-key}
     depends_on:
       rabbitmq:
         condition: service_healthy
diff --git a/src/gapido_auth/config.py b/src/gapido_auth/config.py
index 9fa8bf9..a8a3c5d 100644
--- a/src/gapido_auth/config.py
+++ b/src/gapido_auth/config.py
@@ -1,4 +1,5 @@
 from functools import lru_cache
+from typing import Literal
 
 from pydantic import Field
 from pydantic_settings import BaseSettings, SettingsConfigDict
@@ -22,9 +23,14 @@ class Settings(BaseSettings):
     otp_request_limit: int = 3
     otp_request_window_seconds: int = 300
 
+    sms_provider: Literal["kavenegar", "sms_ir"] = "kavenegar"
+
     kavenegar_api_key: str = "replace-with-real-key"
     kavenegar_login_template: str = "login-otp"
 
+    sms_ir_api_key: str = "replace-with-real-key"
+    sms_ir_verify_template_id: int = 570574
+
     admin_mobile: str = "989120000000"
     grpc_host: str = "0.0.0.0"
     grpc_port: int = 50051
@@ -35,4 +41,3 @@ class Settings(BaseSettings):
 @lru_cache
 def get_settings() -> Settings:
     return Settings()
-
diff --git a/src/gapido_auth/infrastructure/container.py b/src/gapido_auth/infrastructure/container.py
index ceb4f8d..6c6f97b 100644
--- a/src/gapido_auth/infrastructure/container.py
+++ b/src/gapido_auth/infrastructure/container.py
@@ -14,6 +14,7 @@ from gapido_auth.infrastructure.mongo_repositories import (
 )
 from gapido_auth.infrastructure.rabbitmq import RabbitMqSmsPublisher
 from gapido_auth.infrastructure.redis_otp_store import RedisOtpStore
+from gapido_auth.infrastructure.sms_provider import get_sms_template
 
 
 @dataclass(slots=True)
@@ -53,8 +54,7 @@ async def build_auth_service(settings: Settings, rabbitmq_channel: AbstractChann
             otp_request_limit=settings.otp_request_limit,
             otp_request_window_seconds=settings.otp_request_window_seconds,
             refresh_token_ttl_seconds=settings.refresh_token_ttl_seconds,
-            sms_template=settings.kavenegar_login_template,
+            sms_template=get_sms_template(settings),
         ),
     )
     return AppContainer(auth_service=auth_service, mongo_client=mongo_client, redis=redis)
-
diff --git a/src/gapido_auth/infrastructure/sms_ir_client.py b/src/gapido_auth/infrastructure/sms_ir_client.py
new file mode 100644
index 0000000..162e3a5
--- /dev/null
+++ b/src/gapido_auth/infrastructure/sms_ir_client.py
@@ -0,0 +1,56 @@
+import logging
+from typing import Any
+
+import httpx
+
+from gapido_auth.domain.errors import ExternalServiceError
+from gapido_auth.domain.ports import SmsClient
+
+logger = logging.getLogger(__name__)
+
+
+class SmsIrSmsClient(SmsClient):
+    _endpoint = "https://api.sms.ir/v1/send/verify"
+
+    def __init__(
+        self,
+        api_key: str,
+        timeout_seconds: float = 10.0,
+        transport: httpx.AsyncBaseTransport | None = None,
+    ) -> None:
+        self._api_key = api_key
+        self._timeout_seconds = timeout_seconds
+        self._transport = transport
+
+    async def send_otp(self, mobile: str, code: str, template: str) -> None:
+        headers = {
+            "Content-Type": "application/json",
+            "Accept": "application/json",
+            "x-api-key": self._api_key,
+        }
+        payload = {
+            "mobile": mobile,
+            "templateId": int(template),
+            "parameters": [{"name": "OTP", "value": code}],
+        }
+
+        try:
+            async with httpx.AsyncClient(
+                timeout=self._timeout_seconds, transport=self._transport
+            ) as client:
+                response = await client.post(self._endpoint, json=payload, headers=headers)
+        except httpx.HTTPError as exc:
+            logger.warning("SMS.ir network error for mobile=%s", mobile, exc_info=True)
+            raise ExternalServiceError("SMS.ir network error") from exc
+
+        if response.status_code != 200:
+            logger.warning("SMS.ir HTTP error status=%s mobile=%s", response.status_code, mobile)
+            raise ExternalServiceError("SMS.ir HTTP error")
+
+        data: dict[str, Any] = response.json()
+        if str(data.get("status", "")) != "1":
+            logger.warning("SMS.ir API error status=%s mobile=%s", data.get("status"), mobile)
+            raise ExternalServiceError("SMS.ir API error")
+
+        logger.info("OTP SMS sent successfully to mobile=%s via SMS.ir", mobile)
+
diff --git a/src/gapido_auth/infrastructure/sms_provider.py b/src/gapido_auth/infrastructure/sms_provider.py
new file mode 100644
index 0000000..c96e2e3
--- /dev/null
+++ b/src/gapido_auth/infrastructure/sms_provider.py
@@ -0,0 +1,26 @@
+import httpx
+
+from gapido_auth.config import Settings
+from gapido_auth.domain.ports import SmsClient
+from gapido_auth.infrastructure.kavenegar_client import KavenegarSmsClient
+from gapido_auth.infrastructure.sms_ir_client import SmsIrSmsClient
+
+
+def create_sms_client(
+    settings: Settings,
+    transport: httpx.AsyncBaseTransport | None = None,
+) -> SmsClient:
+    match settings.sms_provider:
+        case "kavenegar":
+            return KavenegarSmsClient(settings.kavenegar_api_key, transport=transport)
+        case "sms_ir":
+            return SmsIrSmsClient(settings.sms_ir_api_key, transport=transport)
+
+
+def get_sms_template(settings: Settings) -> str:
+    match settings.sms_provider:
+        case "kavenegar":
+            return settings.kavenegar_login_template
+        case "sms_ir":
+            return str(settings.sms_ir_verify_template_id)
+
diff --git a/src/gapido_auth/infrastructure/worker.py b/src/gapido_auth/infrastructure/worker.py
index 20dfe26..8ede084 100644
--- a/src/gapido_auth/infrastructure/worker.py
+++ b/src/gapido_auth/infrastructure/worker.py
@@ -8,12 +8,13 @@ from aio_pika.abc import AbstractIncomingMessage
 
 from gapido_auth.config import get_settings
 from gapido_auth.domain.entities import SmsJob
-from gapido_auth.infrastructure.kavenegar_client import KavenegarSmsClient
+from gapido_auth.domain.ports import SmsClient
 from gapido_auth.infrastructure.rabbitmq import (
     SMS_ROUTING_KEY,
     connect_robust,
     declare_sms_topology,
 )
+from gapido_auth.infrastructure.sms_provider import create_sms_client
 
 logger = logging.getLogger(__name__)
 MAX_RETRIES = 3
@@ -21,7 +22,7 @@ MAX_RETRIES = 3
 
 async def handle_message(
     message: AbstractIncomingMessage,
-    client: KavenegarSmsClient,
+    client: SmsClient,
     exchange: Any,
     dlx: Any,
 ) -> None:
@@ -68,9 +69,9 @@ async def main() -> None:
         channel = await connection.channel()
         await channel.set_qos(prefetch_count=20)
         exchange, queue, dlx = await declare_sms_topology(channel)
-        client = KavenegarSmsClient(settings.kavenegar_api_key)
+        client = create_sms_client(settings)
         await queue.consume(lambda message: handle_message(message, client, exchange, dlx))
-        logger.info("SMS worker started")
+        logger.info("SMS worker started with provider=%s", settings.sms_provider)
         await asyncio.Future()
 
 
diff --git a/tests/test_kavenegar_client.py b/tests/test_kavenegar_client.py
index 191e2a2..99ab78f 100644
--- a/tests/test_kavenegar_client.py
+++ b/tests/test_kavenegar_client.py
@@ -3,6 +3,7 @@ import pytest
 
 from gapido_auth.domain.errors import ExternalServiceError
 from gapido_auth.infrastructure.kavenegar_client import KavenegarSmsClient
+from gapido_auth.infrastructure.sms_ir_client import SmsIrSmsClient
 
 
 @pytest.mark.asyncio
@@ -28,3 +29,29 @@ async def test_kavenegar_api_error() -> None:
     with pytest.raises(ExternalServiceError):
         await client.send_otp("989120000000", "123456", "login-otp")
 
+
+@pytest.mark.asyncio
+async def test_sms_ir_success() -> None:
+    def handler(request: httpx.Request) -> httpx.Response:
+        assert request.url == "https://api.sms.ir/v1/send/verify"
+        assert request.headers["x-api-key"] == "sms-ir-key"
+        payload = request.read()
+        assert b'"mobile":"989120000000"' in payload
+        assert b'"templateId":570574' in payload
+        assert b'"name":"OTP"' in payload
+        assert b'"value":"123456"' in payload
+        return httpx.Response(200, json={"status": "1"})
+
+    client = SmsIrSmsClient("sms-ir-key", transport=httpx.MockTransport(handler))
+    await client.send_otp("989120000000", "123456", "570574")
+
+
+@pytest.mark.asyncio
+async def test_sms_ir_api_error() -> None:
+    def handler(request: httpx.Request) -> httpx.Response:
+        return httpx.Response(200, json={"status": "0"})
+
+    client = SmsIrSmsClient("sms-ir-key", transport=httpx.MockTransport(handler))
+
+    with pytest.raises(ExternalServiceError):
+        await client.send_otp("989120000000", "123456", "570574")
diff --git a/tests/test_sms_provider.py b/tests/test_sms_provider.py
new file mode 100644
index 0000000..28c8fc4
--- /dev/null
+++ b/tests/test_sms_provider.py
@@ -0,0 +1,26 @@
+from gapido_auth.config import Settings
+from gapido_auth.infrastructure.kavenegar_client import KavenegarSmsClient
+from gapido_auth.infrastructure.sms_ir_client import SmsIrSmsClient
+from gapido_auth.infrastructure.sms_provider import create_sms_client, get_sms_template
+
+
+def test_sms_provider_factory_selects_kavenegar() -> None:
+    settings = Settings(
+        sms_provider="kavenegar",
+        kavenegar_api_key="kavenegar-key",
+        kavenegar_login_template="login-otp",
+    )
+
+    assert isinstance(create_sms_client(settings), KavenegarSmsClient)
+    assert get_sms_template(settings) == "login-otp"
+
+
+def test_sms_provider_factory_selects_sms_ir() -> None:
+    settings = Settings(
+        sms_provider="sms_ir",
+        sms_ir_api_key="sms-ir-key",
+        sms_ir_verify_template_id=570574,
+    )
+
+    assert isinstance(create_sms_client(settings), SmsIrSmsClient)
+    assert get_sms_template(settings) == "570574"