diff --git a/src/app/shared/components/overlay/contact-overlay/contact-form/contact-form.component.html b/src/app/shared/components/overlay/contact-overlay/contact-form/contact-form.component.html
index c35fbcd..907255f 100644
--- a/src/app/shared/components/overlay/contact-overlay/contact-form/contact-form.component.html
+++ b/src/app/shared/components/overlay/contact-overlay/contact-form/contact-form.component.html
@@ -113,7 +113,6 @@
       [(ngModel)]="contactData.phone"
       pattern="[\d\+\-\(\)\/]{10,15}"
       autocomplete="off"
-      required
     />
     <div class="error-msg">
       @if (!phone.valid && phone.touched) {
@@ -126,7 +125,7 @@
         class="btn-delete"
         type="button"
         value="{{ 'contactDialogForm.btnDelete' | translate }}"
-        (click)="closeDialog()"
+        (click)="deleteContact(selectedUser.id)"
       ></app-form-btn>
       } @else {
       <app-form-btn
@@ -149,8 +148,6 @@
           !contactData.lastName ||
           email.invalid ||
           !contactData.email ||
-          phone.invalid ||
-          !contactData.phone ||
           !checkIfUserEmailIsValid(contactData.email)
         "
       ></app-form-btn>
diff --git a/src/app/shared/components/overlay/contact-overlay/contact-form/contact-form.component.ts b/src/app/shared/components/overlay/contact-overlay/contact-form/contact-form.component.ts
index 044d94b..348bb31 100644
--- a/src/app/shared/components/overlay/contact-overlay/contact-form/contact-form.component.ts
+++ b/src/app/shared/components/overlay/contact-overlay/contact-form/contact-form.component.ts
@@ -273,6 +273,17 @@ export class ContactFormComponent implements OnInit, OnChanges {
     return newObj;
   }
 
+  async deleteContact(userId: string) {
+    try {
+      await lastValueFrom(this.apiService.deleteUserById(userId));
+      this.toastNotificationService.deleteContactSuccessToast();
+      this.updateNotifierService.notifyUpdate('contact');
+      this.closeDialog();
+    } catch (error) {
+      console.error(error);
+    }
+  }
+
   closeDialog() {
     this.closeDialogEmitter.emit('');
   }
diff --git a/src/assets/i18n/de.json b/src/assets/i18n/de.json
index c49b443..2b3e2f9 100644
--- a/src/assets/i18n/de.json
+++ b/src/assets/i18n/de.json
@@ -85,7 +85,7 @@
     "invalidMail0": "Sie müssen eine E-Mail Adresse eingeben!",
     "invalidMail1": "Dies ist kein gültiges E-Mail-Format!",
     "invalidMail2": "Diese E-Mail existiert bereits!",
-    "invalidPhone": "Eine Telefonnummer ist erforderlich!",
+    "invalidPhone": "Ungültige Telefonnummer (10–15 Zeichen, Ziffern + ()-/ erlaubt)",
     "firstName": "Vorname",
     "lastName": "Nachname",
     "email": "E-Mail",
diff --git a/src/assets/i18n/en.json b/src/assets/i18n/en.json
index 4501f8e..655c470 100644
--- a/src/assets/i18n/en.json
+++ b/src/assets/i18n/en.json
@@ -85,7 +85,7 @@
     "invalidMail0": "You must enter a mail!",
     "invalidMail1": "This is not a valid email format!",
     "invalidMail2": "This email already exists!",
-    "invalidPhone": "A phone number is required!",
+    "invalidPhone": "Invalid phone number (10–15 chars, digits + ()-/ allowed)",
     "firstName": "First name",
     "lastName": "Last name",
     "email": "Email",