diff --git a/lib/utils/farcaster-utils.js b/lib/utils/farcaster-utils.js
--- a/lib/utils/farcaster-utils.js
+++ b/lib/utils/farcaster-utils.js
@@ -1,7 +1,12 @@
 // @flow
 
+import invariant from 'invariant';
+import * as React from 'react';
+
+import { setSyncedMetadataEntryActionType } from '../actions/synced-metadata-actions.js';
+import { IdentityClientContext } from '../shared/identity-client-context.js';
 import { syncedMetadataNames } from '../types/synced-metadata-types.js';
-import { useSelector } from '../utils/redux-utils.js';
+import { useSelector, useDispatch } from '../utils/redux-utils.js';
 
 function useCurrentUserFID(): ?string {
   return useSelector(
@@ -12,4 +17,29 @@
   );
 }
 
-export { useCurrentUserFID };
+function useLinkFID(): (fid: string) => Promise<void> {
+  const identityClientContext = React.useContext(IdentityClientContext);
+  invariant(identityClientContext, 'identityClientContext should be set');
+
+  const { identityClient } = identityClientContext;
+  const { linkFarcasterAccount } = identityClient;
+
+  const dispatch = useDispatch();
+
+  return React.useCallback(
+    async (fid: string) => {
+      await linkFarcasterAccount(fid);
+
+      dispatch({
+        type: setSyncedMetadataEntryActionType,
+        payload: {
+          name: syncedMetadataNames.CURRENT_USER_FID,
+          data: fid,
+        },
+      });
+    },
+    [dispatch, linkFarcasterAccount],
+  );
+}
+
+export { useCurrentUserFID, useLinkFID };
diff --git a/native/account/registration/registration-server-call.js b/native/account/registration/registration-server-call.js
--- a/native/account/registration/registration-server-call.js
+++ b/native/account/registration/registration-server-call.js
@@ -202,6 +202,7 @@
   const legacySiweServerCall = useLegacySIWEServerCall();
   const identityWalletRegisterCall = useIdentityWalletRegisterCall();
   const dispatch = useDispatch();
+
   const returnedFunc = React.useCallback(
     (input: RegistrationServerCallInput) =>
       new Promise<void>(
@@ -297,11 +298,11 @@
         },
       ),
     [
-      currentStep,
+      currentStep.step,
+      dispatch,
       legacyKeyserverRegisterUsernameAccount,
       identityRegisterUsernameAccount,
       legacySiweServerCall,
-      dispatch,
       identityWalletRegisterCall,
     ],
   );
diff --git a/native/components/connect-farcaster-bottom-sheet.react.js b/native/components/connect-farcaster-bottom-sheet.react.js
--- a/native/components/connect-farcaster-bottom-sheet.react.js
+++ b/native/components/connect-farcaster-bottom-sheet.react.js
@@ -5,11 +5,8 @@
 import { View, StyleSheet } from 'react-native';
 import { useSafeAreaInsets } from 'react-native-safe-area-context';
 
-import { setSyncedMetadataEntryActionType } from 'lib/actions/synced-metadata-actions.js';
 import { useIsAppForegrounded } from 'lib/shared/lifecycle-utils.js';
-import { syncedMetadataNames } from 'lib/types/synced-metadata-types.js';
 import { useCurrentUserFID } from 'lib/utils/farcaster-utils.js';
-import { useDispatch } from 'lib/utils/redux-utils.js';
 
 import FarcasterPrompt from './farcaster-prompt.react.js';
 import FarcasterWebView, {
@@ -20,6 +17,7 @@
 import BottomSheet from '../bottom-sheet/bottom-sheet.react.js';
 import type { RootNavigationProp } from '../navigation/root-navigator.react.js';
 import type { NavigationRoute } from '../navigation/route-names.js';
+import { useOnSuccessConnectToFarcaster } from '../utils/farcaster-utils.js';
 
 const bottomSheetPaddingTop = 32;
 const farcasterPromptHeight = 350;
@@ -34,24 +32,15 @@
 function ConnectFarcasterBottomSheet(props: Props): React.Node {
   const { navigation } = props;
 
-  const dispatch = useDispatch();
+  const { goBack } = navigation;
 
-  const fid = useCurrentUserFID();
+  const [webViewState, setWebViewState] =
+    React.useState<FarcasterWebViewState>('closed');
 
-  const onSuccess = React.useCallback(
-    (newFID: string) => {
-      dispatch({
-        type: setSyncedMetadataEntryActionType,
-        payload: {
-          name: syncedMetadataNames.CURRENT_USER_FID,
-          data: newFID,
-        },
-      });
-    },
-    [dispatch],
-  );
+  const fid = useCurrentUserFID();
 
-  const { goBack } = navigation;
+  const onSuccessConnectToFarcaster =
+    useOnSuccessConnectToFarcaster(setWebViewState);
 
   const bottomSheetRef = React.useRef(null);
 
@@ -71,9 +60,6 @@
     );
   }, [insets.bottom, setContentHeight]);
 
-  const [webViewState, setWebViewState] =
-    React.useState<FarcasterWebViewState>('closed');
-
   const isAppForegrounded = useIsAppForegrounded();
 
   React.useEffect(() => {
@@ -102,10 +88,19 @@
             variant={connectButtonVariant}
           />
         </View>
-        <FarcasterWebView onSuccess={onSuccess} webViewState={webViewState} />
+        <FarcasterWebView
+          onSuccess={onSuccessConnectToFarcaster}
+          webViewState={webViewState}
+        />
       </BottomSheet>
     ),
-    [connectButtonVariant, goBack, onPressConnect, onSuccess, webViewState],
+    [
+      connectButtonVariant,
+      goBack,
+      onPressConnect,
+      onSuccessConnectToFarcaster,
+      webViewState,
+    ],
   );
 
   return connectFarcasterBottomSheet;
diff --git a/native/profile/farcaster-account-settings.react.js b/native/profile/farcaster-account-settings.react.js
--- a/native/profile/farcaster-account-settings.react.js
+++ b/native/profile/farcaster-account-settings.react.js
@@ -3,10 +3,7 @@
 import * as React from 'react';
 import { View } from 'react-native';
 
-import {
-  setSyncedMetadataEntryActionType,
-  clearSyncedMetadataEntryActionType,
-} from 'lib/actions/synced-metadata-actions.js';
+import { clearSyncedMetadataEntryActionType } from 'lib/actions/synced-metadata-actions.js';
 import { syncedMetadataNames } from 'lib/types/synced-metadata-types.js';
 import { useCurrentUserFID } from 'lib/utils/farcaster-utils.js';
 import { useDispatch } from 'lib/utils/redux-utils.js';
@@ -18,6 +15,7 @@
 import type { FarcasterWebViewState } from '../components/farcaster-web-view.react.js';
 import type { NavigationRoute } from '../navigation/route-names.js';
 import { useStyles } from '../themes/colors.js';
+import { useOnSuccessConnectToFarcaster } from '../utils/farcaster-utils.js';
 
 type Props = {
   +navigation: ProfileNavigationProp<'FarcasterAccountSettings'>,
@@ -44,19 +42,8 @@
   const [webViewState, setWebViewState] =
     React.useState<FarcasterWebViewState>('closed');
 
-  const onSuccess = React.useCallback(
-    (newFID: string) => {
-      setWebViewState('closed');
-      dispatch({
-        type: setSyncedMetadataEntryActionType,
-        payload: {
-          name: syncedMetadataNames.CURRENT_USER_FID,
-          data: newFID,
-        },
-      });
-    },
-    [dispatch],
-  );
+  const onSuccessConnectToFarcaster =
+    useOnSuccessConnectToFarcaster(setWebViewState);
 
   const onPressConnectFarcaster = React.useCallback(() => {
     setWebViewState('opening');
@@ -91,14 +78,17 @@
         <View style={styles.promptContainer}>
           <FarcasterPrompt showDisconnectText={!!fid} />
         </View>
-        <FarcasterWebView onSuccess={onSuccess} webViewState={webViewState} />
+        <FarcasterWebView
+          onSuccess={onSuccessConnectToFarcaster}
+          webViewState={webViewState}
+        />
         <View style={styles.buttonContainer}>{button}</View>
       </View>
     ),
     [
       button,
       fid,
-      onSuccess,
+      onSuccessConnectToFarcaster,
       styles.buttonContainer,
       styles.connectContainer,
       styles.promptContainer,
diff --git a/native/utils/farcaster-utils.js b/native/utils/farcaster-utils.js
new file mode 100644
--- /dev/null
+++ b/native/utils/farcaster-utils.js
@@ -0,0 +1,47 @@
+// @flow
+
+import * as React from 'react';
+import { Alert } from 'react-native';
+
+import type { SetState } from 'lib/types/hook-types.js';
+import { useLinkFID } from 'lib/utils/farcaster-utils.js';
+
+import {
+  getFarcasterAccountAlreadyLinkedAlertDetails,
+  UnknownErrorAlertDetails,
+} from './alert-messages.js';
+import type { FarcasterWebViewState } from '../components/farcaster-web-view.react.js';
+
+function useOnSuccessConnectToFarcaster(
+  setWebViewState: SetState<FarcasterWebViewState>,
+): (newFid: string) => Promise<void> {
+  const linkFID = useLinkFID();
+
+  return React.useCallback(
+    async (newFID: string) => {
+      setWebViewState('closed');
+
+      try {
+        await linkFID(newFID);
+      } catch (error) {
+        if (
+          error.message ===
+          'farcaster ID already associated with different user'
+        ) {
+          const { title, message } =
+            getFarcasterAccountAlreadyLinkedAlertDetails();
+
+          Alert.alert(title, message);
+        } else {
+          Alert.alert(
+            UnknownErrorAlertDetails.title,
+            UnknownErrorAlertDetails.message,
+          );
+        }
+      }
+    },
+    [linkFID, setWebViewState],
+  );
+}
+
+export { useOnSuccessConnectToFarcaster };