diff --git a/src/android/verification/SensorControlForegroundDelegate.java b/src/android/verification/SensorControlForegroundDelegate.java
index 32badc9..14b5617 100644
--- a/src/android/verification/SensorControlForegroundDelegate.java
+++ b/src/android/verification/SensorControlForegroundDelegate.java
@@ -5,6 +5,7 @@
 
 import edu.berkeley.eecs.emission.cordova.tracker.Constants;
 import edu.berkeley.eecs.emission.cordova.unifiedlogger.Log;
+import edu.berkeley.eecs.emission.cordova.usercache.UserCacheFactory;
 
 
 /*
@@ -53,6 +54,7 @@
 
 public class SensorControlForegroundDelegate {
     public static final String TAG = "SensorPermissionsAndSettingsForegroundDelegate";
+    private static final String HAS_REQUESTED_NOTIFS_KEY = "HasRequestedNotificationPermission";
 
     private CordovaPlugin plugin = null;
     private CordovaInterface cordova = null;
@@ -775,11 +777,18 @@ public void onActivityResult(int requestCode, int resultCode, Intent data) {
       case SensorControlConstants.ENABLE_NOTIFICATIONS:
         Log.d(mAct, TAG, requestCode + " is our code, handling callback");
         Log.d(mAct, TAG, "Got notification callback from launching app settings");
-        if (SensorControlChecks.checkNotificationsEnabled(cordova.getActivity())) {
-          SensorControlBackgroundChecker.restartFSMIfStartState(cordova.getActivity());
-          cordovaCallback.success();
-        } else {
-          cordovaCallback.error(cordova.getActivity().getString(R.string.notifications_blocked));
+        try {
+            JSONObject jo = new JSONObject();
+            jo.put("ts", System.currentTimeMillis() / 1000);
+            UserCacheFactory.getUserCache(cordova.getActivity()).putLocalStorage(HAS_REQUESTED_NOTIFS_KEY, jo);
+            if (SensorControlChecks.checkNotificationsEnabled(cordova.getActivity())) {
+              SensorControlBackgroundChecker.restartFSMIfStartState(cordova.getActivity());
+              cordovaCallback.success();
+            } else {
+              cordovaCallback.error(cordova.getActivity().getString(R.string.notifications_blocked));
+            }
+        } catch (JSONException e) {
+          cordovaCallback.error(e.getLocalizedMessage());
         }
         break;
       case SensorControlConstants.REMOVE_UNUSED_APP_RESTRICTIONS:
diff --git a/src/ios/Verification/SensorControlForegroundDelegate.m b/src/ios/Verification/SensorControlForegroundDelegate.m
index 4e8e432..b71e525 100644
--- a/src/ios/Verification/SensorControlForegroundDelegate.m
+++ b/src/ios/Verification/SensorControlForegroundDelegate.m
@@ -4,6 +4,8 @@
 #import "LocalNotificationManager.h"
 #import "BEMAppDelegate.h"
 #import "BEMActivitySync.h"
+#import "BEMBuiltinUserCache.h"
+#import "DataUtils.h"
 
 #import <CoreMotion/CoreMotion.h>
 
@@ -13,6 +15,8 @@ @interface SensorControlForegroundDelegate() {
 }
 @end
 
+static NSString* const HAS_REQUESTED_NOTIFS_KEY = @"HasRequestedNotificationPermission";
+
 @implementation SensorControlForegroundDelegate
 
 /*
@@ -259,7 +263,8 @@ -(void) didRecieveFitnessPermission:(BOOL)isPermitted
 - (void)checkAndPromptNotificationPermission {
     NSString* callbackId = [command callbackId];
     @try {
-        if ([[NSUserDefaults standardUserDefaults] boolForKey:@"HasPromptedForUserNotification"]) {
+        // If we have prompted in the past, the popup will not work. Instead, we'll open app settings
+        if ([[BuiltinUserCache database] getLocalStorage:HAS_REQUESTED_NOTIFS_KEY withMetadata:NO] != NULL) {
             NSLog(@"Already prompted request for user notification. Launching app settings.");
             [AppDelegate registerForegroundDelegate:self];
             [self openAppSettings];
@@ -282,7 +287,9 @@ - (void)checkAndPromptNotificationPermission {
 }
 
 - (void) didRegisterUserNotificationSettings:(UIUserNotificationSettings*)newSettings {
-    [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"HasPromptedForUserNotification"];
+    NSDate* now = [NSDate date];
+    [[BuiltinUserCache database] putLocalStorage:HAS_REQUESTED_NOTIFS_KEY
+                                    jsonValue:@{ @"ts": @(now.timeIntervalSince1970) }];
     NSString* callbackId = [command callbackId];
     UIUserNotificationSettings* requestedSettings = [TripDiarySensorControlChecks REQUESTED_NOTIFICATION_TYPES];
     if (requestedSettings.types == newSettings.types) {