diff --git a/README.md b/README.md
index 7fd7dc1..dd0b994 100644
--- a/README.md
+++ b/README.md
@@ -7,12 +7,12 @@ Then you have to copy & paste the desired script into the Scriptable App. Now yo
 ## Vodafone DE Datavolume
 ![Vodafone Widget](https://raw.githubusercontent.com/ThisIsBenny/iOS-Widgets/main/VodafoneDE-Datavolume/preview.jpeg)
 
-This widget loads the remaining data volume via the MyVodafone API. For this purpose, an automatic login via the cell phone network is performed, therefore it is necessary that the WIFI is not active.
+This widget loads the remaining data volume via the MyVodafone API. For this purpose, an automatic login via the cell phone network is performed, therefore it is necessary that the WIFI is not active for the first usage.
+After the first usage, the informations are cached and will be used in case of an active WIFI Connection. The cached information will be also used to prevent the API from a lot of request. The TTL (Time To Live) of the Cache can be setup at the beginning of the script (default is 60 min)
 
 [[Download]](https://raw.githubusercontent.com/ThisIsBenny/iOS-Widgets/main/VodafoneDE-Datavolume/VodafoneDE.js)
 
 _Roadmap_:
-* Caching as Fallback in Case of active WIFI
 * Change Background Color
 * Add diagramm
 * Add GigaDepot volume
diff --git a/VodafoneDE-Datavolume/VodafoneDE.js b/VodafoneDE-Datavolume/VodafoneDE.js
index 43dadcd..a80c121 100644
--- a/VodafoneDE-Datavolume/VodafoneDE.js
+++ b/VodafoneDE-Datavolume/VodafoneDE.js
@@ -4,6 +4,9 @@
 
 // Credits Sillium@GitHub (https://gist.github.com/Sillium/f904fb89444bc8dde12cfc07b8fa8728)
 
+// How many minutes should the cache be valid
+let cacheMinutes = 60;
+
 async function getSessionCookies() {
   let req;
   req = new Request("https://www.vodafone.de/mint/rest/session/start")
@@ -22,20 +25,18 @@ async function getSessionCookies() {
   })
   try {
     let res = await req.loadJSON()
-    console.log(res)
     return { cookies: req.response.cookies, msisdn: res.msisdn}
   } catch (e) {
     console.log(e)
+    throw e
   }
 };
 
 async function getUsage() {
   let {cookies, msisdn} = await getSessionCookies();
-  console.log(cookies)
   let CookieValues = cookies.map(function(v){
     return v.name + "=" + v.value
   })
-  console.log(CookieValues)
   let req;
   req = new Request(`https://www.vodafone.de/api/enterprise-resources/core/bss/sub-nil/mobile/payment/service-usages/subscriptions/${msisdn}/unbilled-usage`)
   req.headers = {
@@ -61,14 +62,43 @@ async function getUsage() {
     }
   } catch (e) {
     console.log(e)
+    throw e
   }
 };
 
-let data = await getUsage()
+var today = new Date();
 
-console.log(data)
+// Set up the file manager.
+const files = FileManager.local()
 
+// Set up cache .
+const cachePath = files.joinPath(files.documentsDirectory(), "widget-vodafone")
+const cacheExists = files.fileExists(cachePath)
+const cacheDate = cacheExists ? files.modificationDate(cachePath) : 0
 
+// Get Data
+let data;
+let lastUpdate
+try {
+  // If cache exists and it's been less than 30 minutes since last request, use cached data.
+  if (cacheExists && (today.getTime() - cacheDate.getTime()) < (cacheMinutes * 60 * 1000)) {
+    console.log("Get from Cache")
+    data = JSON.parse(files.readString(cachePath))
+    lastUpdate = cacheDate
+  } else {
+    console.log("Get from API")
+    data = await getUsage()
+    files.writeString(cachePath, JSON.stringify(data))
+    lastUpdate = today
+  }
+} catch (e) {
+  console.log(e)
+  console.log("Get from Cache")
+  data = JSON.parse(files.readString(cachePath))
+  lastUpdate = cacheDate
+}
+
+// Create Widget
 let widget = new ListWidget();
 
 widget.backgroundColor = new Color("#FD0000")
@@ -90,7 +120,12 @@ let totalGB = (data.total / 1024).toFixed(0)
 let totalValuesText = widget.addText(`${remainingGB} GB von ${totalGB} GB`)
 totalValuesText.font = Font.mediumSystemFont(12)
 
-
+widget.addSpacer()
+let lastUpdateText = widget.addDate(lastUpdate)
+lastUpdateText.font = Font.mediumSystemFont(10)
+lastUpdateText.centerAlignText()
+lastUpdateText.applyTimeStyle()
+lastUpdateText.textColor = Color.darkGray()
 
 if(!config.runsInWidget) {
   await widget.presentSmall()