diff --git a/src/components/Contact.tsx b/src/components/Contact.tsx
index 7d3d638..abb8f3a 100644
--- a/src/components/Contact.tsx
+++ b/src/components/Contact.tsx
@@ -54,9 +54,9 @@ const Contact = () => {
                   <Mail className="w-5 h-5" />
                   <span>support@webklar.com</span>
                 </a>
-                <a href="tel:+491704969375" className="flex items-center gap-3 hover:text-foreground transition-colors group">
+                <a href="tel:+4917623726355" className="flex items-center gap-3 hover:text-foreground transition-colors group">
                   <Phone className="w-5 h-5" />
-                  <span>0170 4969375</span>
+                  <span>0176 23726355</span>
                 </a>
               </div>
             </div>
diff --git a/src/components/Footer.tsx b/src/components/Footer.tsx
index ff05ebc..b011c5b 100644
--- a/src/components/Footer.tsx
+++ b/src/components/Footer.tsx
@@ -32,7 +32,7 @@ const footerLinks: { title: string; links: FooterLink[] }[] = [
     title: "Kontakt",
     links: [
       { id: 5, title: "support@webklar.com", href: "mailto:support@webklar.com" },
-      { id: 6, title: "0170 4969375", href: "tel:+491704969375" },
+      { id: 6, title: "0176 23726355", href: "tel:+4917623726355" },
     ],
   },
   {
diff --git a/src/pages/Contact.tsx b/src/pages/Contact.tsx
index f0512dc..8c0d9d3 100644
--- a/src/pages/Contact.tsx
+++ b/src/pages/Contact.tsx
@@ -196,10 +196,10 @@ const Contact = () => {
                 <div>
                   <div className="label-tag mb-2">Telefon</div>
                   <a
-                    href="tel:+491704969375"
+                    href="tel:+4917623726355"
                     className="text-foreground hover:text-muted-foreground transition-colors"
                   >
-                    0170 4969375
+                    0176 23726355
                   </a>
                 </div>
               </div>
diff --git a/src/test/sofort-paket.test.tsx b/src/test/sofort-paket.test.tsx
index 6f0c5f3..08bf13a 100644
--- a/src/test/sofort-paket.test.tsx
+++ b/src/test/sofort-paket.test.tsx
@@ -136,3 +136,26 @@ describe("B2 Projekte-Bereich ausgeblendet", () => {
     }
   });
 });
+
+describe("B3 Eine Telefonnummer überall", () => {
+  it("die alte Nummer 0170 4969375 kommt in keiner Quelldatei mehr vor", () => {
+    expect(vorkommen(/0170\s?4969375|491704969375/)).toEqual([]);
+  });
+
+  it("Kontaktseite zeigt 0176 23726355 mit passendem tel:-Link", () => {
+    seite("/kontakt");
+    const links = screen.getAllByRole("link", { name: TELEFON });
+    expect(links.length).toBeGreaterThan(0);
+    for (const link of links) expect(link).toHaveAttribute("href", TELEFON_HREF);
+  });
+
+  it("der Footer zeigt dieselbe Nummer", () => {
+    zeige(<Footer />);
+    expect(screen.getByRole("link", { name: TELEFON })).toHaveAttribute("href", TELEFON_HREF);
+  });
+
+  it("der Kontaktabschnitt der Startseite zeigt dieselbe Nummer", () => {
+    zeige(<KontaktAbschnitt />);
+    expect(screen.getByRole("link", { name: TELEFON })).toHaveAttribute("href", TELEFON_HREF);
+  });
+});