diff --git a/UPGRADE-7.3.md b/UPGRADE-7.3.md
index c4fff7bd2301c..6fc756aa9a25f 100644
--- a/UPGRADE-7.3.md
+++ b/UPGRADE-7.3.md
@@ -118,6 +118,11 @@ SecurityBundle
 
  * Deprecate the `security.hide_user_not_found` config option in favor of `security.expose_security_errors`
 
+ Notifier
+ --------
+
+ * Deprecate the `Sms77` transport, use `SevenIo` instead
+
 Serializer
 ----------
 
diff --git a/src/Symfony/Component/Notifier/Bridge/Sms77/CHANGELOG.md b/src/Symfony/Component/Notifier/Bridge/Sms77/CHANGELOG.md
index 7f6ce4e6893ba..d78a5515f79b2 100644
--- a/src/Symfony/Component/Notifier/Bridge/Sms77/CHANGELOG.md
+++ b/src/Symfony/Component/Notifier/Bridge/Sms77/CHANGELOG.md
@@ -1,6 +1,11 @@
 CHANGELOG
 =========
 
+7.3
+---
+
+ * Deprecate the bridge
+
 6.2
 ---
 
diff --git a/src/Symfony/Component/Notifier/Bridge/Sms77/README.md b/src/Symfony/Component/Notifier/Bridge/Sms77/README.md
index 05a5a301e6eba..bcfa7d0252da0 100644
--- a/src/Symfony/Component/Notifier/Bridge/Sms77/README.md
+++ b/src/Symfony/Component/Notifier/Bridge/Sms77/README.md
@@ -1,7 +1,7 @@
 sms77 Notifier
 =================
 
-Provides [sms77](https://www.sms77.io/) integration for Symfony Notifier.
+The sms77 bridge is deprecated, use the Seven.io bridge instead.
 
 DSN example
 -----------
diff --git a/src/Symfony/Component/Notifier/Bridge/Sms77/Sms77Transport.php b/src/Symfony/Component/Notifier/Bridge/Sms77/Sms77Transport.php
index 1b373236a216f..a71a84c3c1ba9 100644
--- a/src/Symfony/Component/Notifier/Bridge/Sms77/Sms77Transport.php
+++ b/src/Symfony/Component/Notifier/Bridge/Sms77/Sms77Transport.php
@@ -23,6 +23,8 @@
 
 /**
  * @author André Matthies <matthiez@gmail.com>
+ *
+ * @deprecated since Symfony 7.3, use the Seven.io bridge instead.
  */
 final class Sms77Transport extends AbstractTransport
 {
diff --git a/src/Symfony/Component/Notifier/Bridge/Sms77/Sms77TransportFactory.php b/src/Symfony/Component/Notifier/Bridge/Sms77/Sms77TransportFactory.php
index 5058d3ad7b0c6..686a7af14c664 100644
--- a/src/Symfony/Component/Notifier/Bridge/Sms77/Sms77TransportFactory.php
+++ b/src/Symfony/Component/Notifier/Bridge/Sms77/Sms77TransportFactory.php
@@ -17,11 +17,15 @@
 
 /**
  * @author André Matthies <matthiez@gmail.com>
+ *
+ * @deprecated since Symfony 7.3, use the Seven.io bridge instead.
  */
 final class Sms77TransportFactory extends AbstractTransportFactory
 {
     public function create(Dsn $dsn): Sms77Transport
     {
+        trigger_deprecation('symfony/sms77-notifier', '7.3', 'The "symfony/sms77-notifier" package is deprecated, use "symfony/sevenio-notifier" instead.');
+
         $scheme = $dsn->getScheme();
 
         if ('sms77' !== $scheme) {
diff --git a/src/Symfony/Component/Notifier/Bridge/Sms77/Tests/Sms77TransportFactoryTest.php b/src/Symfony/Component/Notifier/Bridge/Sms77/Tests/Sms77TransportFactoryTest.php
index cb35fd9a82578..6d00014af1e2a 100644
--- a/src/Symfony/Component/Notifier/Bridge/Sms77/Tests/Sms77TransportFactoryTest.php
+++ b/src/Symfony/Component/Notifier/Bridge/Sms77/Tests/Sms77TransportFactoryTest.php
@@ -15,6 +15,9 @@
 use Symfony\Component\Notifier\Test\AbstractTransportFactoryTestCase;
 use Symfony\Component\Notifier\Test\IncompleteDsnTestTrait;
 
+/**
+ * @group legacy
+ */
 final class Sms77TransportFactoryTest extends AbstractTransportFactoryTestCase
 {
     use IncompleteDsnTestTrait;
diff --git a/src/Symfony/Component/Notifier/Bridge/Sms77/Tests/Sms77TransportTest.php b/src/Symfony/Component/Notifier/Bridge/Sms77/Tests/Sms77TransportTest.php
index 0a1ad1f4a4d06..0d45b84d84577 100644
--- a/src/Symfony/Component/Notifier/Bridge/Sms77/Tests/Sms77TransportTest.php
+++ b/src/Symfony/Component/Notifier/Bridge/Sms77/Tests/Sms77TransportTest.php
@@ -19,6 +19,9 @@
 use Symfony\Component\Notifier\Tests\Transport\DummyMessage;
 use Symfony\Contracts\HttpClient\HttpClientInterface;
 
+/**
+ * @group legacy
+ */
 final class Sms77TransportTest extends TransportTestCase
 {
     public static function createTransport(?HttpClientInterface $client = null, ?string $from = null): Sms77Transport
diff --git a/src/Symfony/Component/Notifier/Bridge/Sms77/composer.json b/src/Symfony/Component/Notifier/Bridge/Sms77/composer.json
index 9113d713843da..8dd642e151321 100644
--- a/src/Symfony/Component/Notifier/Bridge/Sms77/composer.json
+++ b/src/Symfony/Component/Notifier/Bridge/Sms77/composer.json
@@ -17,6 +17,7 @@
     ],
     "require": {
         "php": ">=8.2",
+        "symfony/deprecation-contracts": "^2.5|^3",
         "symfony/http-client": "^6.4|^7.0",
         "symfony/notifier": "^7.2"
     },