diff --git a/README.md b/README.md
index 1751427..6b19af8 100644
--- a/README.md
+++ b/README.md
@@ -44,6 +44,7 @@ Get the client's authentication tokens via [3-legged authorization](https://dev.
   * `forSignIn` If `true`, [oauth/authenticate](https://dev.twitter.com/oauth/reference/get/oauth/authenticate) endpoint is used instead of [oauth/authorize](https://dev.twitter.com/oauth/reference/get/oauth/authorize) (Default: `false`)
   *  `forceLogin` Specify `force_login` (See [Twitter docs](https://dev.twitter.com/oauth/reference/get/oauth/authorize#parameters).) (Default: `false`)
   *  `screenName` Specify `screen_name` (See [Twitter docs](https://dev.twitter.com/oauth/reference/get/oauth/authorize#parameters).)
+* `openUrl` specify an alternative method of opening twitter auth (e.g. a web modal)
 
 * Returns: `Promise` of `{accessToken, accessTokenSecret, id, name}`
   * `accessToken` Access token
diff --git a/src/oauth/auth.js b/src/oauth/auth.js
index 403d6dd..ba07c30 100644
--- a/src/oauth/auth.js
+++ b/src/oauth/auth.js
@@ -1,4 +1,4 @@
-import {Linking} from 'react-native';
+import {Linking,Modal} from 'react-native';
 
 import URLSearchParams from 'url-search-params';
 
@@ -63,6 +63,7 @@ export default async function auth(
   tokens,
   callbackUrl,
   {accessType, forSignIn = false, forceLogin = false, screenName = ''} = {},
+  openUrl
 ) {
   const usePin = typeof callbackUrl.then === 'function';
   const {requestToken, requestTokenSecret} = await getRequestToken(
@@ -70,9 +71,10 @@ export default async function auth(
     usePin ? 'oob' : callbackUrl,
     accessType,
   );
-  Linking.openURL(`https://api.twitter.com/oauth/${forSignIn ? 'authenticate' : 'authorize'}?${
-    query({oauth_token: requestToken, force_login: forceLogin, screen_name: screenName})
-  }`);
+  const url = `https://api.twitter.com/oauth/${forSignIn ? 'authenticate' : 'authorize'}?${
+      query({oauth_token: requestToken, force_login: forceLogin, screen_name: screenName})
+      }`;
+  openUrl ? openUrl(url):Linking.openURL(url);
   return getAccessToken(
     {...tokens, requestToken, requestTokenSecret},
     await (
diff --git a/src/stream/index.js b/src/stream/index.js
new file mode 100644
index 0000000..9912ecd
--- /dev/null
+++ b/src/stream/index.js
@@ -0,0 +1,3 @@
+export default function stream() {
+  console.error(new Error('Streaming APIs are not supported on iOS.'));
+}