diff --git a/lib/servicios/servicio_anuncios.dart b/lib/servicios/servicio_anuncios.dart
index f5d9fdf..669400b 100644
--- a/lib/servicios/servicio_anuncios.dart
+++ b/lib/servicios/servicio_anuncios.dart
@@ -15,13 +15,28 @@ const _bannerAdUnitIdReal = 'ca-app-pub-6038935671414339/5658618378';
 /// Real interstitial unit id, provisioned in the AdMob console (iap-freemium-unlock).
 const _interstitialAdUnitIdReal = 'ca-app-pub-6038935671414339/4189478248';
 
-/// Real id in release builds only; test id everywhere else (debug/profile,
-/// including internal-testing-track builds run via `flutter run --release`
-/// on a personal device — see the "never tap your own ads" note above).
+/// TESTING-PHASE SWITCH. While `true`, release builds serve Google's official
+/// TEST ad units instead of the real ones, so none of the closed-testing
+/// human testers can generate invalid traffic against the AdMob account
+/// (they cannot be registered as AdMob test devices). Flip to `false` for
+/// the production release — that is the ONLY change needed to start serving
+/// real ads. This does NOT affect the AdMob application id in
+/// `AndroidManifest.xml`, which stays real in every build (it only
+/// initializes the SDK and carries none of the click risk).
+const usarAnunciosDePruebaEnRelease = true;
+
+/// Real id in release builds only, and only once [usarAnunciosDePruebaEnRelease]
+/// is flipped to `false`; test id everywhere else (debug/profile, including
+/// internal-testing-track builds run via `flutter run --release` on a
+/// personal device — see the "never tap your own ads" note above).
 const bannerAdUnitId =
-    kReleaseMode ? _bannerAdUnitIdReal : bannerAdUnitIdPrueba;
+    kReleaseMode && !usarAnunciosDePruebaEnRelease
+        ? _bannerAdUnitIdReal
+        : bannerAdUnitIdPrueba;
 const interstitialAdUnitId =
-    kReleaseMode ? _interstitialAdUnitIdReal : interstitialAdUnitIdPrueba;
+    kReleaseMode && !usarAnunciosDePruebaEnRelease
+        ? _interstitialAdUnitIdReal
+        : interstitialAdUnitIdPrueba;
 
 /// Ads port + AdMob adapter (Design "Interfaces / Contracts", ADR-6): owns
 /// the entitlement gate for both surfaces, the interstitial's session
diff --git a/test/servicios/servicio_anuncios_test.dart b/test/servicios/servicio_anuncios_test.dart
index c5f192d..0c21790 100644
--- a/test/servicios/servicio_anuncios_test.dart
+++ b/test/servicios/servicio_anuncios_test.dart
@@ -161,6 +161,36 @@ void main() {
     });
   });
 
+  group('usarAnunciosDePruebaEnRelease — interruptor de fase de pruebas', () {
+    test('mientras esta en true, bannerAdUnitId e interstitialAdUnitId son los '
+        'ids oficiales de prueba de Google', () {
+      expect(usarAnunciosDePruebaEnRelease, isTrue);
+      expect(bannerAdUnitId, equals('ca-app-pub-3940256099942544/6300978111'));
+      expect(
+        interstitialAdUnitId,
+        equals('ca-app-pub-3940256099942544/1033173712'),
+      );
+    });
+
+    test('los ids reales siguen presentes como constantes en el archivo (no se '
+        'pueden perder en un futuro edit)', () {
+      final source =
+          File('lib/servicios/servicio_anuncios.dart').readAsStringSync();
+      expect(
+        source.contains("'ca-app-pub-6038935671414339/5658618378'"),
+        isTrue,
+        reason: 'el id real del banner debe seguir presente en el archivo',
+      );
+      expect(
+        source.contains("'ca-app-pub-6038935671414339/4189478248'"),
+        isTrue,
+        reason:
+            'el id real del interstitial debe seguir presente en el '
+            'archivo',
+      );
+    });
+  });
+
   group('debeMostrarBanner', () {
     test('free: true', () {
       final servicio = construir(