diff --git a/chat_window.php b/chat_window.php
index 6c06024..846ee7b 100644
--- a/chat_window.php
+++ b/chat_window.php
@@ -296,7 +296,12 @@ if (empty($user_id)) {
                     currentUser = response.user;
                     
                     // Actualizar header
-                    document.getElementById('userName').textContent = currentUser.name || 'Usuario';
+                    const displayName = currentUser.name || 'Usuario';
+                    const phoneNumber = currentUser.phone_number || '';
+                    document.getElementById('userName').innerHTML = `
+                        ${escapeHtml(displayName)}
+                        ${phoneNumber ? `<br><small class="opacity-75">${escapeHtml(phoneNumber)}</small>` : ''}
+                    `;
                     document.getElementById('userAvatar').innerHTML = 
                         `<span>${(currentUser.name || 'U').charAt(0).toUpperCase()}</span>`;