diff --git a/lib/biju/hayes.rb b/lib/biju/hayes.rb
index 07cbbda..a99e125 100644
--- a/lib/biju/hayes.rb
+++ b/lib/biju/hayes.rb
@@ -85,10 +85,12 @@ module Biju
     end
 
     def send(sms, options = {})
-      at_command('+CMGS', sms.phone_number)
+      result = at_command('+CMGS', (sms.to_pdu.length - 2) / 2)
 
-      write("#{sms.message}#{26.chr}")
-      hayes_to_obj(modem.wait)
+      if result[:prompt]
+        modem.write("#{sms.to_pdu}#{26.chr}")
+        hayes_to_obj(modem.wait(length: 8).lstrip)
+      end
     end
 
     private
diff --git a/lib/biju/parser.rb b/lib/biju/parser.rb
index 885ffdf..8ec83b1 100644
--- a/lib/biju/parser.rb
+++ b/lib/biju/parser.rb
@@ -8,13 +8,16 @@ module Biju
     rule(:at_string) { request | response }
 
     # REQUEST
-    rule(:request) { str('+++') | str('A/') | (prefix >> (cr.absent? >> lf.absent? >> any).repeat(0)) >> response.maybe }
+    rule(:request) do
+      str('+++') | str('A/') | (prefix >> (cr.absent? >> lf.absent? >> any).repeat(0)) >>
+      (cr >> crlf >> response).maybe
+    end
     rule(:prefix) { str('AT') | str('at') }
 
     # RESPONSE
-    rule(:response) { cr >> crlf >> (((status | command) >> crlf) | prompt)  }
-    rule(:prompt) { str('> ') }
-    rule(:command) { mgl | pms | mgf | mserror }
+    rule(:response) { ((status | command) >> crlf) | prompt }
+    rule(:prompt) { str('> ').as(:prompt) }
+    rule(:command) { mgl | pms | mgf | mgs | mserror }
 
     rule(:mserror) { str('+CMS ERROR').as(:cmd) >> str(': ') >> message }
     rule(:mgl) do
@@ -28,6 +31,9 @@ module Biju
     rule(:mgf) do
       str('+CMGF').as(:cmd) >> str(': ') >> boolean.as(:result) >> crlf >> crlf >> status
     end
+    rule(:mgs) do
+      str('+CMGS').as(:cmd) >> str(': ') >> int.as(:result) >> crlf >> crlf >> status
+    end
 
     rule(:array) do
       (data >> (comma >> data).repeat).as(:array)
@@ -64,6 +70,7 @@ module Biju
   end
 
   class ATTransform < Parslet::Transform
+    rule(prompt: simple(:prompt)) { { prompt: true } }
     rule(cmd: simple(:cmd), infos: subtree(:infos), message: simple(:message)) do
       {cmd: cmd.to_s, infos: infos, message: message.to_s}
     end
diff --git a/spec/biju/parser_spec.rb b/spec/biju/parser_spec.rb
index d71edc7..2223f7b 100644
--- a/spec/biju/parser_spec.rb
+++ b/spec/biju/parser_spec.rb
@@ -18,8 +18,10 @@ describe Biju::ATParser do
     it "parses cmgs prompt" do
       mgs = "AT+CMGS=18\r\r\n> "
 
-      expect { Biju::ATTransform.new.apply(
-        Biju::ATParser.new.parse(mgs)) }.not_to raise_error
+      result = Biju::ATTransform.new.apply(
+        Biju::ATParser.new.parse(mgs))
+
+      expect(result).to include(prompt: true)
     end
 
     it "parses messages list" do
@@ -71,6 +73,16 @@ describe Biju::ATParser do
       expect(result).to include(status: true)
       expect(result[:result]).to be_false
     end
+
+    it "parses message sent response" do
+      mgs = "+CMGS: 163\r\n\r\nOK\r\n"
+
+      result = Biju::ATTransform.new.apply(
+        Biju::ATParser.new.parse(mgs))
+
+      expect(result).to include(status: true)
+      expect(result[:result]).to eq(163)
+    end
   end
 
   it "raises ParseFailed exception" do