diff --git a/components/serviceworker.js b/components/serviceworker.js
index 5266e3fb5..58d6745f4 100644
--- a/components/serviceworker.js
+++ b/components/serviceworker.js
@@ -158,9 +158,10 @@ export const ServiceWorkerProvider = ({ children }) => {
     // since (a lot of) browsers don't support the pushsubscriptionchange event,
     // we sync with server manually by checking on every page reload if the push subscription changed.
     // see https://medium.com/@madridserginho/how-to-handle-webpush-api-pushsubscriptionchange-event-in-modern-browsers-6e47840d756f
+    navigator?.serviceWorker?.controller?.postMessage?.({ action: STORE_OS, os: detectOS() })
+    logger.info('sent STORE_OS to service worker: ', detectOS())
     navigator?.serviceWorker?.controller?.postMessage?.({ action: SYNC_SUBSCRIPTION })
     logger.info('sent SYNC_SUBSCRIPTION to service worker')
-    navigator?.serviceWorker?.controller?.postMessage?.({ action: STORE_OS, os: detectOS() })
   }, [registration, permission.notification])
 
   const contextValue = useMemo(() => ({
diff --git a/sw/eventListener.js b/sw/eventListener.js
index 1efdee342..ed34eb744 100644
--- a/sw/eventListener.js
+++ b/sw/eventListener.js
@@ -11,11 +11,20 @@ const storage = new ServiceWorkerStorage('sw:storage', 1)
 let messageChannelPort
 let actionChannelPort
 
-// TODO 756.2 Fix iOS check, initialValue isn't updated if iOS is true
+// DONE 756.2 Fix iOS check, initialValue isn't updated if iOS is true
+// FIX: store os in ServiceWorkerStorage and update it on every STORE_OS message
+
 // operating system. the value will be received via a STORE_OS message from app since service workers don't have access to window.navigator
 let os = ''
 const iOS = () => os === 'iOS'
 
+async function getOS () {
+  if (!os) {
+    os = await storage.getItem('os') || ''
+  }
+  return os
+}
+
 // current push notification count for badge purposes
 let activeCount = 0
 
@@ -32,7 +41,7 @@ export function onPush (sw) {
       // generate random ID for every incoming push for better tracing in logs
       const nid = crypto.randomUUID()
       log(`[sw:push] ${nid} - received notification with tag ${tag}`)
-
+      const currentOS = await getOS()
       // due to missing proper tag support in Safari on iOS, we can't rely on the tag built-in filter.
       // we therefore fetch all notifications with the same tag and manually filter them, too.
       // see https://bugs.webkit.org/show_bug.cgi?id=258922
@@ -57,7 +66,7 @@ export function onPush (sw) {
         // close them and then we display the notification.
         const notifications = await sw.registration.getNotifications({ tag })
         // we only close notifications manually on iOS because we don't want to degrade android UX just because iOS is behind in their support.
-        if (iOS()) {
+        if (currentOS === 'iOS') {
           log(`[sw:push] ${nid} - closing existing notifications`)
           notifications.filter(({ tag: nTag }) => nTag === tag).forEach(n => n.close())
         }
@@ -85,7 +94,7 @@ export function onPush (sw) {
         // return null
       }
 
-      return await mergeAndShowNotification(sw, payload, notifications, tag, nid)
+      return await mergeAndShowNotification(sw, payload, notifications, tag, nid, currentOS)
     })())
   }
 }
@@ -95,7 +104,7 @@ export function onPush (sw) {
 const immediatelyShowNotification = (tag) =>
   !tag || ['TIP', 'FORWARDEDTIP', 'EARN', 'STREAK', 'TERRITORY_TRANSFER'].includes(tag.split('-')[0])
 
-const mergeAndShowNotification = async (sw, payload, currentNotifications, tag, nid) => {
+const mergeAndShowNotification = async (sw, payload, currentNotifications, tag, nid, currentOS) => {
   // sanity check
   const otherTagNotifications = currentNotifications.filter(({ tag: nTag }) => nTag !== tag)
   if (otherTagNotifications.length > 0) {
@@ -120,7 +129,7 @@ const mergeAndShowNotification = async (sw, payload, currentNotifications, tag,
   const SUM_SATS_TAGS = ['DEPOSIT', 'WITHDRAWAL']
   // this should reflect the amount of notifications that were already merged before
   let initialAmount = currentNotifications[0]?.data?.amount || 1
-  if (iOS()) initialAmount = 1
+  if (currentOS === 'iOS') initialAmount = 1
   log(`[sw:push] ${nid} - initial amount: ${initialAmount}`)
   const mergedPayload = currentNotifications.reduce((acc, { data }) => {
     let newAmount, newSats
@@ -132,7 +141,7 @@ const mergeAndShowNotification = async (sw, payload, currentNotifications, tag,
     }
     const newPayload = { ...data, amount: newAmount, sats: newSats }
     return newPayload
-  }, { ...incomingData, amount: 1 }) // 1 is hard coded to test iOS scenario, should be initialValue
+  }, { ...incomingData, amount: initialAmount })
 
   log(`[sw:push] ${nid} - merged payload: ${JSON.stringify(mergedPayload)}`)
 
@@ -177,7 +186,6 @@ const mergeAndShowNotification = async (sw, payload, currentNotifications, tag,
 }
 
 // TODO 756.3 sometimes you get sent to very old threads, this is because the notification is not updated
-// PROPOSAL close all notifications with the same tag
 
 export function onNotificationClick (sw) {
   return (event) => {
@@ -253,19 +261,21 @@ export function onPushSubscriptionChange (sw) {
 }
 
 export function onMessage (sw) {
-  return (event) => {
+  return async (event) => {
     if (event.data.action === ACTION_PORT) {
       actionChannelPort = event.ports[0]
       return
     }
     if (event.data.action === STORE_OS) {
-      os = event.data.os
+      event.waitUntil(storage.setItem('os', event.data.os))
       return
     }
     if (event.data.action === MESSAGE_PORT) {
       messageChannelPort = event.ports[0]
     }
     log('[sw:message] received message', 'info', { action: event.data.action })
+    const currentOS = await getOS()
+    log('[sw:message] stored os: ' + currentOS, 'info', { action: event.data.action })
     if (event.data.action === STORE_SUBSCRIPTION) {
       log('[sw:message] storing subscription in IndexedDB', 'info', { endpoint: event.data.subscription.endpoint })
       return event.waitUntil(storage.setItem('subscription', { ...event.data.subscription, swVersion: 2 }))