diff --git a/src/TaxBaik.Application/Services/InquiryService.cs b/src/TaxBaik.Application/Services/InquiryService.cs
index 5954f18..c9f5e01 100644
--- a/src/TaxBaik.Application/Services/InquiryService.cs
+++ b/src/TaxBaik.Application/Services/InquiryService.cs
@@ -12,7 +12,7 @@ public class InquiryService(
     IInquiryNotificationService notificationService,
     IMemoryCache memoryCache)
 {
-    private static readonly Regex PhoneRegex = new(@"^01[0-9]\d{7,8}$");
+    private static readonly Regex PhoneRegex = new(@"^\d{10,11}$");
 
     public async Task<int> SubmitAsync(
         string name, string phone, string serviceType, string message,