diff --git a/EnvelopeGenerator.Application/DTOs/EnvelopeReceiver/EnvelopeReceiverBasicDto.cs b/EnvelopeGenerator.Application/DTOs/EnvelopeReceiver/EnvelopeReceiverBasicDto.cs
index 4dfdf6a8..64c5b869 100644
--- a/EnvelopeGenerator.Application/DTOs/EnvelopeReceiver/EnvelopeReceiverBasicDto.cs
+++ b/EnvelopeGenerator.Application/DTOs/EnvelopeReceiver/EnvelopeReceiverBasicDto.cs
@@ -25,5 +25,7 @@ namespace EnvelopeGenerator.Application.DTOs.EnvelopeReceiver
         public DateTime AddedWhen { get; init; }
 
         public DateTime? ChangedWhen { get; init; }
+
+        public bool HasPhoneNumber { get; init; }
     }
 }
\ No newline at end of file
diff --git a/EnvelopeGenerator.Application/MappingExtensions,.cs b/EnvelopeGenerator.Application/MappingExtensions.cs
similarity index 100%
rename from EnvelopeGenerator.Application/MappingExtensions,.cs
rename to EnvelopeGenerator.Application/MappingExtensions.cs
diff --git a/EnvelopeGenerator.Domain/Entities/EnvelopeReceiverBase.cs b/EnvelopeGenerator.Domain/Entities/EnvelopeReceiverBase.cs
index 8b2e537e..7a344170 100644
--- a/EnvelopeGenerator.Domain/Entities/EnvelopeReceiverBase.cs
+++ b/EnvelopeGenerator.Domain/Entities/EnvelopeReceiverBase.cs
@@ -46,6 +46,10 @@ namespace EnvelopeGenerator.Domain.Entities
         [RegularExpression(@"^\+[0-9]+$", ErrorMessage = "Phone number must start with '+' followed by digits.")]
         public string? PhoneNumber { get; set; }
 
+        [NotMapped]
         public (int Envelope, int Receiver) Id => (Envelope: EnvelopeId, Receiver: ReceiverId);
+
+        [NotMapped]
+        public bool HasPhoneNumber => PhoneNumber is not null;
     }
 }
\ No newline at end of file