diff --git a/native/account/fullscreen-siwe-panel.react.js b/native/account/fullscreen-siwe-panel.react.js
--- a/native/account/fullscreen-siwe-panel.react.js
+++ b/native/account/fullscreen-siwe-panel.react.js
@@ -8,7 +8,7 @@
 import { setDataLoadedActionType } from 'lib/actions/client-db-store-actions.js';
 import { useWalletLogIn } from 'lib/hooks/login-hooks.js';
 import { type SIWEResult, SIWEMessageTypes } from 'lib/types/siwe-types.js';
-import { ServerError } from 'lib/utils/errors.js';
+import { ServerError, getMessageForException } from 'lib/utils/errors.js';
 import { useDispatch } from 'lib/utils/redux-utils.js';
 import { usingCommServicesAccessToken } from 'lib/utils/services-utils.js';
 
@@ -67,6 +67,20 @@
     ],
   );
 
+  const onNonceExpired = React.useCallback(
+    (registrationOrLogin: 'registration' | 'login') => {
+      Alert.alert(
+        registrationOrLogin === 'registration'
+          ? 'Registration attempt timed out'
+          : 'Login attempt timed out',
+        'Please try again',
+        [{ text: 'OK', onPress: goBackToPrompt }],
+        { cancelable: false },
+      );
+    },
+    [goBackToPrompt],
+  );
+
   const legacySiweServerCall = useLegacySIWEServerCall();
   const walletLogIn = useWalletLogIn();
   const successRef = React.useRef(false);
@@ -80,20 +94,39 @@
             await commRustModule.findUserIDForWalletAddress(result.address);
           const findUserIDResponse = JSON.parse(findUserIDResponseString);
           if (findUserIDResponse.userID || findUserIDResponse.isReserved) {
-            await walletLogIn(result.address, result.message, result.signature);
+            try {
+              await walletLogIn(
+                result.address,
+                result.message,
+                result.signature,
+              );
+            } catch (e) {
+              const messageForException = getMessageForException(e);
+              if (messageForException === 'nonce expired') {
+                onNonceExpired('login');
+              } else {
+                throw e;
+              }
+            }
           } else if (enableNewRegistrationMode) {
             await onAccountDoesNotExist(result);
           } else {
-            await registrationServerCall({
-              farcasterID: null,
-              accountSelection: {
-                accountType: 'ethereum',
-                ...result,
-                avatarURI: null,
-              },
-              avatarData: null,
-              clearCachedSelections: () => {},
-            });
+            try {
+              await registrationServerCall({
+                farcasterID: null,
+                accountSelection: {
+                  accountType: 'ethereum',
+                  ...result,
+                  avatarURI: null,
+                },
+                avatarData: null,
+                clearCachedSelections: () => {},
+                onNonceExpired: () => onNonceExpired('registration'),
+              });
+            } catch {
+              // We swallow exceptions here because registrationServerCall
+              // already handles showing Alerts, and we don't want to show two
+            }
           }
         } catch (e) {
           Alert.alert(
@@ -102,7 +135,6 @@
             [{ text: 'OK', onPress: goBackToPrompt }],
             { cancelable: false },
           );
-          throw e;
         }
       } else {
         try {
@@ -124,7 +156,7 @@
             [{ text: 'OK', onPress: goBackToPrompt }],
             { cancelable: false },
           );
-          throw e;
+          return;
         }
         dispatch({
           type: setDataLoadedActionType,
@@ -141,6 +173,7 @@
       dispatch,
       legacySiweServerCall,
       onAccountDoesNotExist,
+      onNonceExpired,
     ],
   );
 
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
@@ -20,6 +20,7 @@
   logInActionSources,
 } from 'lib/types/account-types.js';
 import { syncedMetadataNames } from 'lib/types/synced-metadata-types.js';
+import { getMessageForException } from 'lib/utils/errors.js';
 import { useDispatchActionPromise } from 'lib/utils/redux-promise-utils.js';
 import { useDispatch } from 'lib/utils/redux-utils.js';
 import { usingCommServicesAccessToken } from 'lib/utils/services-utils.js';
@@ -219,6 +220,7 @@
               farcasterID,
               siweBackupSecrets,
               clearCachedSelections,
+              onNonceExpired,
             } = input;
             const keyserverURL = passedKeyserverURL ?? defaultURLPrefix;
             if (
@@ -255,10 +257,15 @@
                   fid: farcasterID,
                 });
               } catch (e) {
-                Alert.alert(
-                  UnknownErrorAlertDetails.title,
-                  UnknownErrorAlertDetails.message,
-                );
+                const messageForException = getMessageForException(e);
+                if (messageForException === 'nonce expired') {
+                  onNonceExpired();
+                } else {
+                  Alert.alert(
+                    UnknownErrorAlertDetails.title,
+                    UnknownErrorAlertDetails.message,
+                  );
+                }
                 throw e;
               }
             }
diff --git a/native/account/registration/registration-terms.react.js b/native/account/registration/registration-terms.react.js
--- a/native/account/registration/registration-terms.react.js
+++ b/native/account/registration/registration-terms.react.js
@@ -1,8 +1,13 @@
 // @flow
 
+import type {
+  StackNavigationEventMap,
+  StackNavigationState,
+  StackOptions,
+} from '@react-navigation/core';
 import invariant from 'invariant';
 import * as React from 'react';
-import { Text, View, Image, Linking } from 'react-native';
+import { Text, View, Image, Linking, Alert } from 'react-native';
 
 import type { SIWEBackupSecrets } from 'lib/types/siwe-types.js';
 
@@ -19,7 +24,11 @@
 } from './registration-types.js';
 import commSwooshSource from '../../img/comm-swoosh.png';
 import { logInActionType } from '../../navigation/action-types.js';
-import type { NavigationRoute } from '../../navigation/route-names.js';
+import type { RootNavigationProp } from '../../navigation/root-navigator.react.js';
+import type {
+  NavigationRoute,
+  ScreenParamList,
+} from '../../navigation/route-names.js';
 import { useStyles } from '../../themes/colors.js';
 
 export type RegistrationTermsParams = {
@@ -59,16 +68,43 @@
     setCachedSelections({});
   }, [setCachedSelections]);
 
+  const { navigation } = props;
+  const goBackToHome = navigation.getParent<
+    ScreenParamList,
+    'Registration',
+    StackNavigationState,
+    StackOptions,
+    StackNavigationEventMap,
+    RootNavigationProp<'Registration'>,
+  >()?.goBack;
+  const onNonceExpired = React.useCallback(() => {
+    setCachedSelections(oldUserSelections => ({
+      ...oldUserSelections,
+      ethereumAccount: undefined,
+    }));
+    Alert.alert(
+      'Registration attempt timed out',
+      'Please try to connect your Ethereum wallet again',
+      [{ text: 'OK', onPress: goBackToHome }],
+      {
+        cancelable: false,
+      },
+    );
+  }, [goBackToHome, setCachedSelections]);
+
   const onProceed = React.useCallback(async () => {
     setRegistrationInProgress(true);
     try {
-      await register({ ...userSelections, clearCachedSelections });
+      await register({
+        ...userSelections,
+        clearCachedSelections,
+        onNonceExpired,
+      });
     } finally {
       setRegistrationInProgress(false);
     }
-  }, [register, userSelections, clearCachedSelections]);
+  }, [register, userSelections, clearCachedSelections, onNonceExpired]);
 
-  const { navigation } = props;
   React.useEffect(() => {
     if (!registrationInProgress) {
       return undefined;
diff --git a/native/account/registration/registration-types.js b/native/account/registration/registration-types.js
--- a/native/account/registration/registration-types.js
+++ b/native/account/registration/registration-types.js
@@ -45,6 +45,7 @@
   +avatarData: ?AvatarData,
   +siweBackupSecrets?: ?SIWEBackupSecrets,
   +clearCachedSelections: () => void,
+  +onNonceExpired: () => mixed,
 };
 
 export type CachedUserSelections = {