diff --git a/EnvelopeGenerator.Web/wwwroot/js/annotation.js b/EnvelopeGenerator.Web/wwwroot/js/annotation.js
index f6235298..e9dd259d 100644
--- a/EnvelopeGenerator.Web/wwwroot/js/annotation.js
+++ b/EnvelopeGenerator.Web/wwwroot/js/annotation.js
@@ -80,7 +80,7 @@
             value: locale_date_dd_mm_yyyy(),
             readOnly: true
         })
-
+        
         //city
         var location = await getLocation();
         const id_city = PSPDFKit.generateInstantId()
@@ -103,6 +103,7 @@
             name: id_city,
             annotationIds: PSPDFKit.Immutable.List([annotation_city.id]),
             value: location.city,
+            readOnly: isMobile()
         })
 
         /**
diff --git a/EnvelopeGenerator.Web/wwwroot/js/util.js b/EnvelopeGenerator.Web/wwwroot/js/util.js
index e58edff4..551bc841 100644
--- a/EnvelopeGenerator.Web/wwwroot/js/util.js
+++ b/EnvelopeGenerator.Web/wwwroot/js/util.js
@@ -46,11 +46,19 @@ async function getLocation() {
 }
 
 const getLocaleDateString = _ => new Date().toLocaleDateString('de-DE')
-
+ 
 function locale_date_dd_mm_yyyy() {
     const today = new Date();
     const day = String(today.getDate()).padStart(2, '0');
     const month = String(today.getMonth() + 1).padStart(2, '0');
     const year = String(today.getFullYear()).slice(-4);
     return `${day}/${month}/${year}`;
+}
+
+let __is_mobile = null;
+function isMobile() {
+    if (__is_mobile === null) {
+        __is_mobile = /Mobi|Android/i.test(window.navigator.userAgent);
+    }
+    return __is_mobile;
 }
\ No newline at end of file