diff --git a/lib/phone_number.rb b/lib/phone_number.rb
index <HASH>..<HASH> 100644
--- a/lib/phone_number.rb
+++ b/lib/phone_number.rb
@@ -2,6 +2,8 @@ class PhoneNumber < ActiveRecord::Base
   belongs_to :vcard, :class_name => 'Vcards::Vcard'
   belongs_to :object, :polymorphic => true
 
+  validates_presence_of :number
+
   def to_s
     case phone_number_type
     when 'phone'
Validate presence of attribute number in PhoneNumber.