diff --git a/android/src/main/java/io/invertase/firebase/auth/RNFirebaseAuth.java b/android/src/main/java/io/invertase/firebase/auth/RNFirebaseAuth.java
index b807574f..c5871f76 100644
--- a/android/src/main/java/io/invertase/firebase/auth/RNFirebaseAuth.java
+++ b/android/src/main/java/io/invertase/firebase/auth/RNFirebaseAuth.java
@@ -561,6 +561,108 @@ class RNFirebaseAuth extends ReactContextBaseJavaModule {
     }
   }
 
+  /**
+   * signInWithPhoneNumber
+   *
+   * @param appName
+   * @param phoneNumber
+   */
+  @ReactMethod
+  public void signInWithPhoneNumber(String appName, final String phoneNumber, final Promise promise) {
+    Log.d(TAG, "signInWithPhoneNumber");
+    FirebaseApp firebaseApp = FirebaseApp.getInstance(appName);
+    final FirebaseAuth firebaseAuth = FirebaseAuth.getInstance(firebaseApp);
+
+    // Reset the verification Id
+    mVerificationId = null;
+
+    PhoneAuthProvider.getInstance(firebaseAuth).verifyPhoneNumber(phoneNumber, 60, TimeUnit.SECONDS,
+      mReactContext.getCurrentActivity(), new PhoneAuthProvider.OnVerificationStateChangedCallbacks() {
+        private boolean promiseResolved = false;
+
+        @Override
+        public void onVerificationCompleted(final PhoneAuthCredential phoneAuthCredential) {
+          // User has been automatically verified, log them in
+          firebaseAuth.signInWithCredential(phoneAuthCredential)
+            .addOnCompleteListener(new OnCompleteListener<AuthResult>() {
+              @Override
+              public void onComplete(@NonNull Task<AuthResult> task) {
+                if (task.isSuccessful()) {
+                  // onAuthStateChanged will pick up the user change
+                  Log.d(TAG, "signInWithPhoneNumber:autoVerified:signInWithCredential:onComplete:success");
+                  // To ensure that there is no hanging promise, we resolve it with a null verificationId
+                  // as calling ConfirmationResult.confirm(code) is invalid in this case anyway
+                  if (!promiseResolved) {
+                    WritableMap verificationMap = Arguments.createMap();
+                    verificationMap.putNull("verificationId");
+                    promise.resolve(verificationMap);
+                  }
+                } else {
+                  // With phone auth, the credential will only every be rejected if the user
+                  // account linked to the phone number has been disabled
+                  Exception exception = task.getException();
+                  Log.e(TAG, "signInWithPhoneNumber:autoVerified:signInWithCredential:onComplete:failure", exception);
+                  if (promiseResolved) {
+                    // In the scenario where an SMS code has been sent, we have no way to report
+                    // back to the front-end that as the promise has already been used
+                  } else {
+                    promiseRejectAuthException(promise, exception);
+                  }
+                }
+              }
+            });
+        }
+
+        @Override
+        public void onVerificationFailed(FirebaseException e) {
+          // This callback is invoked in an invalid request for verification is made,
+          // e.g. phone number format is incorrect, or the SMS quota for the project
+          // has been exceeded
+          Log.d(TAG, "signInWithPhoneNumber:verification:failed");
+          promiseRejectAuthException(promise, e);
+        }
+
+        @Override
+        public void onCodeSent(String verificationId, PhoneAuthProvider.ForceResendingToken forceResendingToken) {
+          // TODO: This isn't being saved anywhere if the activity gets restarted when going to the SMS app
+          mVerificationId = verificationId;
+          WritableMap verificationMap = Arguments.createMap();
+          verificationMap.putString("verificationId", verificationId);
+          promise.resolve(verificationMap);
+          promiseResolved = true;
+        }
+
+        @Override
+        public void onCodeAutoRetrievalTimeOut(String verificationId) {
+          super.onCodeAutoRetrievalTimeOut(verificationId);
+          // Purposefully not doing anything with this at the moment
+        }
+      });
+  }
+
+  @ReactMethod
+  public void _confirmVerificationCode(String appName, final String verificationCode, final Promise promise) {
+    FirebaseApp firebaseApp = FirebaseApp.getInstance(appName);
+    FirebaseAuth firebaseAuth = FirebaseAuth.getInstance(firebaseApp);
+
+    PhoneAuthCredential credential = PhoneAuthProvider.getCredential(mVerificationId, verificationCode);
+
+    firebaseAuth.signInWithCredential(credential)
+      .addOnCompleteListener(new OnCompleteListener<AuthResult>() {
+        @Override
+        public void onComplete(@NonNull Task<AuthResult> task) {
+          if (task.isSuccessful()) {
+            Log.d(TAG, "_confirmVerificationCode:signInWithCredential:onComplete:success");
+            promiseWithUser(task.getResult().getUser(), promise);
+          } else {
+            Exception exception = task.getException();
+            Log.e(TAG, "_confirmVerificationCode:signInWithCredential:onComplete:failure", exception);
+            promiseRejectAuthException(promise, exception);
+          }
+        }
+      });
+  }
+
   /**
    * confirmPasswordReset
    *
diff --git a/lib/modules/auth/ConfirmationResult.js b/lib/modules/auth/ConfirmationResult.js
new file mode 100644
index 00000000..6bfda24a
--- /dev/null
+++ b/lib/modules/auth/ConfirmationResult.js
@@ -0,0 +1,32 @@
+/**
+ * @url https://firebase.google.com/docs/reference/js/firebase.User
+ */
+export default class ConfirmationResult {
+  _auth: Object;
+  _verificationId: string;
+
+  /**
+   *
+   * @param auth
+   * @param verificationId The phone number authentication operation's verification ID.
+   */
+  constructor(auth: Object, verificationId: string) {
+    this._auth = auth;
+    this._verificationId = verificationId;
+  }
+
+  /**
+   *
+   * @param verificationCode
+   * @return {*}
+   */
+  confirm(verificationCode: string): Promise<Object> {
+    return this._auth._interceptUserValue(
+      this._auth._native._confirmVerificationCode(verificationCode)
+    );
+  }
+
+  get verificationId(): String | null {
+    return _verificationId;
+  }
+}
diff --git a/lib/modules/auth/index.js b/lib/modules/auth/index.js
index 395dd00d..46988232 100644
--- a/lib/modules/auth/index.js
+++ b/lib/modules/auth/index.js
@@ -1,6 +1,7 @@
 // @flow
 import User from './user';
 import ModuleBase from './../../utils/ModuleBase';
+import ConfirmationResult from './ConfirmationResult';
 
 // providers
 import EmailAuthProvider from './providers/Email';
@@ -8,6 +9,7 @@ import GoogleAuthProvider from './providers/Google';
 import GithubAuthProvider from './providers/Github';
 import TwitterAuthProvider from './providers/Twitter';
 import FacebookAuthProvider from './providers/Facebook';
+import PhoneAuthProvider from './providers/Phone';
 
 export default class Auth extends ModuleBase {
   static _NAMESPACE = 'auth';
@@ -146,6 +148,16 @@ export default class Auth extends ModuleBase {
     );
   }
 
+  /**
+   * Asynchronously signs in using a phone number.
+   *
+   */
+  signInWithPhoneNumber(phoneNumber: string): Promise<Object> {
+    return this._native.signInWithPhoneNumber(phoneNumber).then((result) => {
+      return new ConfirmationResult(this, result.verificationId);
+    });
+  }
+
   /**
    * Send reset password instructions via email
    * @param {string} email The email to send password reset instructions
diff --git a/lib/modules/auth/providers/Phone.js b/lib/modules/auth/providers/Phone.js
new file mode 100644
index 00000000..9fa405d6
--- /dev/null
+++ b/lib/modules/auth/providers/Phone.js
@@ -0,0 +1,10 @@
+export default {
+  credential(verificationId, code) {
+    return {
+      token: verificationId,
+      secret: code,
+      provider: 'phone',
+      providerId: 'phone',
+    };
+  },
+};