diff --git a/README.md b/README.md
index 4c76c94..488d628 100644
--- a/README.md
+++ b/README.md
@@ -27,6 +27,10 @@ Or install it yourself as:
   puts sms
 end
 
+# method to send sms
+sms = Biju::Sms.new(:phone_number => '+3312345678', :message => 'hello world')
+@modem.send(sms)
+
 @modem.close
 ```
 ## TODO
diff --git a/lib/biju/modem.rb b/lib/biju/modem.rb
index 03950fe..b9bf222 100644
--- a/lib/biju/modem.rb
+++ b/lib/biju/modem.rb
@@ -9,11 +9,20 @@ module Biju
     #
     #   Biju::Modem.new(:port => '/dev/ttyUSB0')
     #
-    def initialize(options={})
+    def initialize(options={}, &block)
       raise Exception.new("Port is required") unless options[:port]
+      pin = options.delete(:pin)
       @connection = connection(options)
       cmd("AT")
+      # initialize modem
+      cmd("ATZ")
+      # unlock pin code
+      cmd("AT+CPIN=\"#{pin}\"") if pin
+      # set SMS text mode
       cmd("AT+CMGF=1")
+      # set extended error reports
+      cmd('AT+CMEE=1')
+      #instance_eval &block if block_given?
     end
 
     # Close the serial connection.
@@ -22,8 +31,12 @@ module Biju
     end
 
     # Return an Array of Sms if there is messages nad return nil if not.
-    def messages
-      sms = cmd("AT+CMGL=\"ALL\"")
+    def messages(which = "ALL")
+      # read message from all storage in the mobile phone (sim+mem)
+      cmd('AT+CPMS="MT"')
+      # get message list
+      sms = cmd('AT+CMGL="%s"' % which )
+      # collect messages
       msgs = sms.scan(/\+CMGL\:\s*?(\d+)\,.*?\,\"(.+?)\"\,.*?\,\"(.+?)\".*?\n(.*)/)
       return nil unless msgs
       msgs.collect!{ |msg| Biju::Sms.new(:id => msg[0], :phone_number => msg[1], :datetime => msg[2], :message => msg[3].chomp) }
@@ -35,6 +48,17 @@ module Biju
       cmd("AT+CMGD=#{id}")
     end
 
+    def send(sms, options = {})
+      # initiate the sms, and wait for either
+      # the text prompt or an error message
+      cmd("AT+CMGS=\"#{sms.phone_number}\"")
+
+      # send the sms, and wait until
+      # it is accepted or rejected
+      cmd("#{sms.message}#{26.chr}")
+      # ... check reception
+    end
+
     private
     def connection(options)
       port = options.delete(:port)
@@ -47,7 +71,8 @@ module Biju
 
     def cmd(cmd)
       @connection.write(cmd + "\r")
-      wait
+      wait_str = wait
+      #p "#{cmd} --> #{wait_str}"
     end
 
     def wait