diff --git a/lib/plivo/resources/calls.rb b/lib/plivo/resources/calls.rb
index 116d5e03..e1f791fc 100644
--- a/lib/plivo/resources/calls.rb
+++ b/lib/plivo/resources/calls.rb
@@ -282,8 +282,8 @@ def create(from, to, answer_url, answer_method = 'POST', options = nil)
                      true, %w[GET POST])
 
         params = {
-          from: from,
-          to: to.join('<'),
+          from: format_phone_number(from),
+          to: to.map{|x| format_phone_number(x)}.join('<'),
           answer_url: answer_url,
           answer_method: answer_method
         }
@@ -397,7 +397,6 @@ def each
       #                                     - To filter out those numbers that contain a particular number sequence, use to_number={ sequence}
       #                                     - To filter out a number that matches an exact number, use to_number={ exact_number}
       def list_live(options = nil)
-        
         if options.nil?
           options = {}
         else
diff --git a/lib/plivo/resources/messages.rb b/lib/plivo/resources/messages.rb
index a0f4b75c..8b6f14ec 100644
--- a/lib/plivo/resources/messages.rb
+++ b/lib/plivo/resources/messages.rb
@@ -83,8 +83,8 @@ def create(src, dst, text, options = nil, powerpack_uuid = nil)
         end
 
         params = {
-          src: src,
-          dst: dst.join('<'),
+          src: format_phone_number(src),
+          dst: dst.map{|x| format_phone_number(x)}.join('<'),
           text: text,
           powerpack_uuid: powerpack_uuid
         }
diff --git a/lib/plivo/utils.rb b/lib/plivo/utils.rb
index d0ea0304..0b90fd8b 100644
--- a/lib/plivo/utils.rb
+++ b/lib/plivo/utils.rb
@@ -7,6 +7,7 @@ module Plivo
   module Utils
     module_function
 
+    VANITY_4_LETTERS_KEYS_REGEX = /[SVYZ]/.freeze
     TYPE_WHITELIST = [Integer]
     TYPE_WHITELIST.push(Fixnum, Bignum) unless 1.class == Integer
 
@@ -107,5 +108,27 @@ def valid_signature?(uri, nonce, signature, auth_token)
       sha256_digest = OpenSSL::Digest.new('sha256')
       Base64.encode64(OpenSSL::HMAC.digest(sha256_digest, auth_token, data_to_sign)).strip() == signature
     end
+
+    def format_phone_number(number)
+      return if number.nil?
+      formatted_num = vanity_conversion(number)
+      formatted_num = formatted_num.gsub(/[^0-9]/, '')
+      if formatted_num.length >=7 && formatted_num.length <= 14
+        return '+' + formatted_num.to_s
+      else
+        raise_invalid_request("Please enter a valid phone number")
+      end
+    end
+
+    def vanity_conversion(phone)
+      return phone.gsub(Regexp.new('[a-zA-Z]')) do |c|
+        c.upcase!
+        # subtract "A"
+        n = (c.ord - 65) / 3
+        # account for #7 & #9 which have 4 chars
+        n -= 1 if c.match(VANITY_4_LETTERS_KEYS_REGEX)
+        (n + 2).to_s
+      end
+    end
   end
 end
diff --git a/spec/resource_messages_spec.rb b/spec/resource_messages_spec.rb
index 3670f8e7..76d6fcbe 100644
--- a/spec/resource_messages_spec.rb
+++ b/spec/resource_messages_spec.rb
@@ -103,8 +103,8 @@ def to_json_list(list_object)
     compare_requests(uri: '/v1/Account/MAXXXXXXXXXXXXXXXXXX/Message/',
                      method: 'POST',
                      data: {
-                       src: '9898989890',
-                       dst: '9090909090<9898989898',
+                       src: '+9898989890',
+                       dst: '+9090909090<+9898989898',
                        text: 'message',
                        powerpack_uuid: nil,
                        type: 'sms',
@@ -120,8 +120,8 @@ def to_json_list(list_object)
     expect do
       @api.messages
           .create(
-            '9898989898',
-            %w[9090909090 9898989898],
+            '+9898989898',
+            %w[+9090909090 +9898989898],
             'message',
             type: 'sms',
             url: 'http://url.com',