diff --git a/src/main/resources/templates/views/apps/mypage/updateCorporateUser.html b/src/main/resources/templates/views/apps/mypage/updateCorporateUser.html
index af0840f..2e59782 100644
--- a/src/main/resources/templates/views/apps/mypage/updateCorporateUser.html
+++ b/src/main/resources/templates/views/apps/mypage/updateCorporateUser.html
@@ -94,7 +94,7 @@
                         // 휴대폰 번호 변경 체크
                         if (isNewPhoneVisible) {
                             if (window.isAuthVerified) {
-                                const prefix = document.querySelector('#phoneMobile .select_selected').textContent;
+                                const prefix = $('#phoneMobile').val();
                                 const middle = document.getElementById('newMobileMiddle').value;
                                 const last = document.getElementById('newMobileLast').value;
                                 const newMobileNumber = `${prefix}-${middle}-${last}`;
diff --git a/src/main/resources/templates/views/apps/mypage/updatePersonalUser.html b/src/main/resources/templates/views/apps/mypage/updatePersonalUser.html
index e12fba1..1ca3aa0 100644
--- a/src/main/resources/templates/views/apps/mypage/updatePersonalUser.html
+++ b/src/main/resources/templates/views/apps/mypage/updatePersonalUser.html
@@ -110,7 +110,7 @@
                         // 휴대폰 번호 변경 체크
                         if (isNewPhoneVisible) {
                             if (window.isAuthVerified) {
-                                const prefix = document.querySelector('#phoneMobile .select_selected').value;
+                                const prefix = $('#phoneMobile').val();
                                 const middle = document.getElementById('newMobileMiddle').value;
                                 const last = document.getElementById('newMobileLast').value;
                                 const newMobileNumber = `${prefix}-${middle}-${last}`;