Plug is for sending the sms in dynamic crm 2011.

First need to do the early binding and add it to the classlibrary.
then give the required references:

then the coding is:


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Xrm;
using System.Diagnostics;
using System.ServiceModel;
using Microsoft.Xrm.Sdk;
using Microsoft.Xrm.Sdk.Query;
using System.Windows.Browser;
using System.Net;
using System.IO;
using System.ServiceModel.Description;

using Microsoft.Xrm.Sdk.Query;
using Microsoft.Xrm.Sdk.Discovery;
using Microsoft.Xrm.Sdk.Messages;
using Microsoft.Crm.Sdk.Messages;
using Microsoft.Xrm.Sdk.Client;





namespace mop.men.SendSMS
{
    public class SendingSms : IPlugin
    {

        public const string AUTHORIZE = "http:\link";

        string ret = null;
        private OrganizationServiceProxy _serviceProxy;

        public void Execute(IServiceProvider serviceProvider)
        {
           

            IPluginExecutionContext context = (IPluginExecutionContext)
            serviceProvider.GetService(typeof(IPluginExecutionContext));

            Entity entity;

            // Check if the input parameters property bag contains a target
            // of the create operation and that target is of type Entity.
            if (context.InputParameters.Contains("Target") && context.InputParameters["Target"] is Entity)
            {

                // Obtain the target business entity from the input parameters.
                entity = (Entity)context.InputParameters["Target"];

                // Verify that the entity represents a contact.
                if (entity.LogicalName != "new_sms")
                {
                    return;
                }
            }
            else
            {
                return;
            }

            try
            {
                IOrganizationServiceFactory serviceFactory = (IOrganizationServiceFactory)serviceProvider.GetService(typeof(IOrganizationServiceFactory));
                IOrganizationService service = serviceFactory.CreateOrganizationService(context.UserId);

                Entity entity1 = (Entity)context.InputParameters["Target"];

                ColumnSet cols = new ColumnSet(
                                     new String[] { "subject", "new_phonenumber" });

                var contact = service.Retrieve("new_sms", entity1.Id, cols);

                string subjects = contact["subject"].ToString();
                string phonenumber = contact["new_phonenumber"].ToString();

                ret = AUTHORIZE + "?no=" + phonenumber + "&msg=" + subjects;

              //  WebRequest request = WebRequest.Create("your url comes here with parameters and stuf like in IE");
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(ret);
                HttpWebResponse response = (HttpWebResponse)request.GetResponse();

                SetStateRequest setStatePhoneCall = new SetStateRequest
                {
                    EntityMoniker = new EntityReference(new_sms.EntityLogicalName, entity1.Id),
                    State = new OptionSetValue((int)slk_smsState.Completed),
                    Status = new OptionSetValue(-1)
                };

                service.Execute(setStatePhoneCall);

                //Console.WriteLine("PhoneCall entity instance has been marked as completed.");

                //PhoneCallState.Completed

            }
            catch (FaultException<OrganizationServiceFault> ex)
            {
                throw new InvalidPluginExecutionException("An error occurred in the plug-in.", ex);
            }
        }

    }

}

and register this plug in for the create 

then doing customize in ribbon area for sending button:

<CustomAction Id="ss_SendSMS" Location="Mscrm.Form.new_sms.MainTab.Save.Controls._children" Sequence="1">

            <CommandUIDefinition>

              <Button Id="btn_newSendSMS" Command="Mscrm.RunSomeJS" LabelText="Send SMS" ToolTipTitle="Send SMS" ToolTipDescription="Sends the SMS" TemplateAlias="o1" Image16by16="/_imgs/SFA/SendAsEmail_16.png" Image32by32="/_imgs/SFA/SendAsEmail_32.png" />

            </CommandUIDefinition>

          </CustomAction>

<CommandDefinition Id="Mscrm.RunSomeJS">

            <EnableRules> </EnableRules>

            <DisplayRules />

            <Actions>

              <JavaScriptFunction FunctionName="SendSMS" Library="$Webresource:new_sendingsms"/>

            </Actions>

          </CommandDefinition>

the Java script is : 

function SendSMS()

{

Xrm.Page.data.entity.save("save");

}