diff --git a/android/build.gradle b/android/build.gradle
index 07e88d0c..fe2c8ef2 100644
--- a/android/build.gradle
+++ b/android/build.gradle
@@ -1,7 +1,7 @@
 buildscript {
     repositories {
-        jcenter()
         google()
+        jcenter()
     }
 
     dependencies {
diff --git a/android/src/main/java/io/wazo/callkeep/RNCallKeepModule.java b/android/src/main/java/io/wazo/callkeep/RNCallKeepModule.java
index 1466545d..b4c8073a 100644
--- a/android/src/main/java/io/wazo/callkeep/RNCallKeepModule.java
+++ b/android/src/main/java/io/wazo/callkeep/RNCallKeepModule.java
@@ -49,7 +49,7 @@
 
 // @see https://github.com/kbagchiGWC/voice-quickstart-android/blob/9a2aff7fbe0d0a5ae9457b48e9ad408740dfb968/exampleConnectionService/src/main/java/com/twilio/voice/examples/connectionservice/VoiceConnectionServiceActivity.java
 public class RNCallKeepModule extends ReactContextBaseJavaModule {
-    public static final int REQUEST_READ_PHONE_STATE = 394858;
+    public static final int REQUEST_READ_PHONE_STATE = 1337;
     public static final int REQUEST_REGISTER_CALL_PROVIDER = 394859;
 
     public static final String CHECKING_PERMS = "CHECKING_PERMS";
@@ -228,6 +228,18 @@ public static Boolean isConnectionServiceAvailable() {
         return Build.VERSION.SDK_INT >= 23;
     }
 
+    @ReactMethod
+    public void backToForeground() {
+        Context context = getAppContext();
+        String packageName = context.getApplicationContext().getPackageName();
+        Intent focusIntent = context.getPackageManager().getLaunchIntentForPackage(packageName).cloneFilter();
+
+        focusIntent.addFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
+
+        Activity activity = getCurrentActivity();
+        activity.startActivity(focusIntent);
+    }
+
     private void registerPhoneAccount(Context appContext) {
         if (!isConnectionServiceAvailable()) {
             return;
diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 00000000..955662e7
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,136 @@
+export type Events = 'didReceiveStartCallAction' |
+  'answerCall' |
+  'endCall' |
+  'didActivateAudioSession' |
+  'didDisplayIncomingCall' |
+  'didPerformSetMutedCallAction';
+
+type HandleType = 'generic' | 'number' | 'email';
+
+interface IOptions {
+  ios: {
+    appName: string,
+    imageName?: string,
+    ringtoneSound?: string,
+  },
+  android: {
+    alertTitle: string,
+    alertDescription: string,
+    cancelButton: string,
+    okButton: string,
+  },
+}
+
+export type DidReceiveStartCallActionPayload = { handle: string };
+export type AnswerCallPayload = { callUUID: string };
+export type EndCallPayload = AnswerCallPayload;
+export type DidDisplayIncomingCallPayload = string | undefined;
+export type DidPerformSetMutedCallActionPayload = boolean;
+
+export default class RNCallKeep {
+  static addEventListener(type: Events, handler: (args: any) => void) {
+
+  }
+
+  static removeEventListener(type: Events, handler: (args: any) => void) {
+
+  }
+
+  static async setup(options: IOptions): Promise<void> {
+
+  }
+
+  static displayIncomingCall(
+    uuid: string,
+    handle: string,
+    localizedCallerName?: string,
+    handleType?: HandleType,
+    hasVideo?: boolean,
+  ) {
+
+  }
+
+  /**
+   * @description startCall method is available only on iOS.
+  */
+  static startCall(
+    uuid: string,
+    handle: string,
+    handleType?: HandleType,
+    hasVideo: boolean,
+    contactIdentifier?: string,
+  ) {
+
+  }
+
+  /**
+     * @description reportConnectedOutgoingCallWithUUID method is available only on iOS.
+  */
+  static reportConnectedOutgoingCallWithUUID(uuid: string) {
+
+  }
+
+  static endCall(uuid: string) {
+
+  }
+
+  static endAllCalls() {
+
+  }
+
+  /**
+     * @description supportConnectionService method is available only on Android.
+  */
+  static supportConnectionService(): boolean {
+
+  }
+
+  /**
+     * @description hasPhoneAccount method is available only on Android.
+  */
+  static async hasPhoneAccount(): Promise<boolean> {
+
+  }
+
+  /**
+     * @description setMutedCall method is available only on iOS.
+  */
+  static setMutedCall(uuid: string, muted: boolean) {
+
+  }
+
+  /**
+     * @description setMutedCall method is available only on iOS.
+  */
+  static checkIfBusy(): Promise<boolean> {
+
+  }
+
+  /**
+     * @description setMutedCall method is available only on iOS.
+  */
+  static checkSpeaker(): Promise<boolean> {
+
+  }
+
+  /**
+     * @description setAvailable method is available only on Android.
+  */
+  static setAvailable(active: boolean) {
+
+  }
+
+  /**
+     * @description setAvailable method is available only on Android.
+  */
+  static setCurrentCallActive() {
+
+  }
+
+  /**
+     * @description setAvailable method is available only on Android.
+  */
+  static backToForeground() {
+
+  }
+}
\ No newline at end of file
diff --git a/index.js b/index.js
index 18a88a3c..18d88809 100644
--- a/index.js
+++ b/index.js
@@ -148,6 +148,14 @@ class RNCallKeep {
     });
   };
 
+  backToForeground() {
+    if (isIOS) {
+      return;
+    }
+
+    NativeModules.RNCallKeep.backToForeground();
+  }
+
   /*
   static holdCall(uuid, onHold) {
     RNCallKeepModule.setHeldCall(uuid, onHold);
diff --git a/package.json b/package.json
index 2877d226..c013eaaf 100644
--- a/package.json
+++ b/package.json
@@ -20,6 +20,7 @@
     "url": "https://github.com/wazo-pbx/react-native-callkeep/issues"
   },
   "homepage": "https://github.com/wazo-pbx/react-native-callkeep#readme",
+  "typings": "./index.d.ts",
   "peerDependencies": {
     "react-native": ">=0.40.0"
   },