diff --git a/backend/core/src/main/java/site/timecapsulearchive/core/domain/auth/service/MessageVerificationService.java b/backend/core/src/main/java/site/timecapsulearchive/core/domain/auth/service/MessageVerificationService.java
index 9992f9e6a..178bf62e0 100644
--- a/backend/core/src/main/java/site/timecapsulearchive/core/domain/auth/service/MessageVerificationService.java
+++ b/backend/core/src/main/java/site/timecapsulearchive/core/domain/auth/service/MessageVerificationService.java
@@ -14,6 +14,7 @@
 import site.timecapsulearchive.core.infra.sms.dto.SmsApiResponse;
 
 @Service
+@Transactional
 @RequiredArgsConstructor
 public class MessageVerificationService {
 
@@ -42,6 +43,8 @@ public VerificationMessageSendResponse sendVerificationMessage(
 
         final SmsApiResponse apiResponse = smsApiService.sendMessage(receiver, message);
 
+        Member findMember = memberService.findMemberByMemberId(memberId);
+        findMember.updatePhoneNumber(receiver);
         messageAuthenticationCacheRepository.save(memberId, code);
 
         return VerificationMessageSendResponse.success(apiResponse.resultCode(),
@@ -63,7 +66,6 @@ private String generateMessage(final String code, final String appHashKey) {
             + appHashKey;
     }
 
-    @Transactional
     public MemberRandomNicknameResponse getRandomNickname(
         final Long memberId,
         final Integer certificationNumber
diff --git a/backend/core/src/main/java/site/timecapsulearchive/core/domain/member/entity/Member.java b/backend/core/src/main/java/site/timecapsulearchive/core/domain/member/entity/Member.java
index 5a57c3483..d2c9d4bce 100644
--- a/backend/core/src/main/java/site/timecapsulearchive/core/domain/member/entity/Member.java
+++ b/backend/core/src/main/java/site/timecapsulearchive/core/domain/member/entity/Member.java
@@ -100,4 +100,9 @@ private Member(String profileUrl, SocialType socialType, String email, String au
     public void updateVerification() {
         this.isVerified = true;
     }
+
+    public void updatePhoneNumber(String phone) {
+        this.phone = phone;
+    }
+
 }