diff --git a/packages/app/lib/common/index.js b/packages/app/lib/common/index.js
index e979845e17..e46007d785 100644
--- a/packages/app/lib/common/index.js
+++ b/packages/app/lib/common/index.js
@@ -366,6 +366,16 @@ const mapOfDeprecationReplacements = {
       TaskState: 'TaskState',
     },
   },
+  functions: {
+    default: {
+      useEmulator: 'connectFirestoreEmulator()',
+      httpsCallable: 'httpsCallable()',
+      httpsCallableFromUrl: 'httpsCallableFromUrl()',
+    },
+    statics: {
+      HttpsErrorCode: 'HttpsErrorCode',
+    },
+  },
 };
 
 const modularDeprecationMessage =
diff --git a/packages/functions/__tests__/functions.test.ts b/packages/functions/__tests__/functions.test.ts
index 2797e0ab92..0e1af414a8 100644
--- a/packages/functions/__tests__/functions.test.ts
+++ b/packages/functions/__tests__/functions.test.ts
@@ -1,4 +1,4 @@
-import { afterAll, beforeAll, describe, expect, it } from '@jest/globals';
+import { afterAll, beforeAll, beforeEach, describe, expect, it, jest } from '@jest/globals';
 
 import functions, {
   firebase,
@@ -9,6 +9,14 @@ import functions, {
   HttpsErrorCode,
 } from '../lib';
 
+import {
+  createCheckV9Deprecation,
+  CheckV9DeprecationFunction,
+} from '../../app/lib/common/unitTestUtils';
+
+// @ts-ignore test
+import FirebaseModule from '../../app/lib/internal/FirebaseModule';
+
 describe('Cloud Functions', function () {
   describe('namespace', function () {
     beforeAll(async function () {
@@ -85,4 +93,61 @@ describe('Cloud Functions', function () {
       expect(HttpsErrorCode).toBeDefined();
     });
   });
+
+  describe('test `console.warn` is called for RNFB v8 API & not called for v9 API', function () {
+    let functionsRefV9Deprecation: CheckV9DeprecationFunction;
+
+    beforeEach(function () {
+      functionsRefV9Deprecation = createCheckV9Deprecation(['functions']);
+
+      // @ts-ignore test
+      jest.spyOn(FirebaseModule.prototype, 'native', 'get').mockImplementation(() => {
+        return new Proxy(
+          {},
+          {
+            get: () =>
+              jest.fn().mockResolvedValue({
+                source: 'cache',
+                changes: [],
+                documents: [],
+                metadata: {},
+                path: 'foo',
+              } as never),
+          },
+        );
+      });
+    });
+
+    describe('Cloud Functions', function () {
+      it('useFunctionsEmulator()', function () {
+        const app = firebase.app();
+        const functions = app.functions();
+        functionsRefV9Deprecation(
+          () => connectFunctionsEmulator(functions, 'localhost', 8080),
+          () => functions.useEmulator('localhost', 8080),
+          'useEmulator',
+        );
+      });
+
+      it('httpsCallable()', function () {
+        const app = firebase.app();
+        const functions = app.functions();
+        functionsRefV9Deprecation(
+          () => httpsCallable(functions, 'example'),
+          () => functions.httpsCallable('example'),
+          'httpsCallable',
+        );
+      });
+
+      it('httpsCallableFromUrl()', function () {
+        const app = firebase.app();
+        const functions = app.functions();
+        functionsRefV9Deprecation(
+          () => httpsCallableFromUrl(functions, 'https://example.com/example'),
+          () => functions.httpsCallableFromUrl('https://example.com/example'),
+          'httpsCallableFromUrl',
+        );
+      });
+    });
+  });
 });
diff --git a/packages/functions/e2e/functions.e2e.js b/packages/functions/e2e/functions.e2e.js
index ccc15faf97..f2f81a1d1e 100644
--- a/packages/functions/e2e/functions.e2e.js
+++ b/packages/functions/e2e/functions.e2e.js
@@ -448,7 +448,7 @@ describe('functions() modular', function () {
 
     it('accepts passing in a region string as first arg to an app', async function () {
       const { getApp } = modular;
-      const { getFunctions } = functionsModular;
+      const { getFunctions, httpsCallable } = functionsModular;
       const region = 'europe-west1';
 
       const functionsForRegion = getFunctions(getApp(), region);
@@ -461,7 +461,7 @@ describe('functions() modular', function () {
 
       getApp().functions(region)._customUrlOrRegion.should.equal(region);
 
-      const functionRunner = functionsForRegion.httpsCallable('testFunctionCustomRegion');
+      const functionRunner = httpsCallable(functionsForRegion, 'testFunctionCustomRegion');
 
       const response = await functionRunner();
       response.data.should.equal(region);
@@ -469,7 +469,7 @@ describe('functions() modular', function () {
 
     it('accepts passing in a custom url string as first arg to an app', async function () {
       const { getApp } = modular;
-      const { getFunctions } = functionsModular;
+      const { getFunctions, httpsCallable } = functionsModular;
       const customUrl = 'https://us-central1-react-native-firebase-testing.cloudfunctions.net';
 
       const functionsForCustomUrl = getFunctions(getApp(), customUrl);
@@ -482,7 +482,7 @@ describe('functions() modular', function () {
 
       functionsForCustomUrl._customUrlOrRegion.should.equal(customUrl);
 
-      const functionRunner = functionsForCustomUrl.httpsCallable('testFunctionDefaultRegionV2');
+      const functionRunner = httpsCallable(functionsForCustomUrl, 'testFunctionDefaultRegionV2');
 
       const response = await functionRunner();
       response.data.should.equal('null');
diff --git a/packages/functions/lib/modular/index.js b/packages/functions/lib/modular/index.js
index 366687514a..96a076a28b 100644
--- a/packages/functions/lib/modular/index.js
+++ b/packages/functions/lib/modular/index.js
@@ -22,6 +22,7 @@
  */
 
 import { getApp } from '@react-native-firebase/app';
+import { MODULAR_DEPRECATION_ARG } from '@react-native-firebase/app/lib/common';
 
 /**
  * Returns a Functions instance for the given app.
@@ -46,7 +47,7 @@ export function getFunctions(app, regionOrCustomDomain) {
  * @returns {void}
  */
 export function connectFunctionsEmulator(functionsInstance, host, port) {
-  return functionsInstance.useEmulator(host, port);
+  return functionsInstance.useEmulator.call(functionsInstance, host, port, MODULAR_DEPRECATION_ARG);
 }
 
 /**
@@ -57,7 +58,12 @@ export function connectFunctionsEmulator(functionsInstance, host, port) {
  * @returns {HttpsCallable}
  */
 export function httpsCallable(functionsInstance, name, options) {
-  return functionsInstance.httpsCallable(name, options);
+  return functionsInstance.httpsCallable.call(
+    functionsInstance,
+    name,
+    options,
+    MODULAR_DEPRECATION_ARG,
+  );
 }
 
 /**
@@ -68,7 +74,12 @@ export function httpsCallable(functionsInstance, name, options) {
  * @returns {HttpsCallable}
  */
 export function httpsCallableFromUrl(functionsInstance, url, options) {
-  return functionsInstance.httpsCallableFromUrl(url, options);
+  return functionsInstance.httpsCallableFromUrl.call(
+    functionsInstance,
+    url,
+    options,
+    MODULAR_DEPRECATION_ARG,
+  );
 }
 
 export { HttpsErrorCode } from '../index';