Sending SMS programatically

There are two ways to send sms in android

1.Using smsManager
2.Using Intent

1.Using smsManager

private void sendSMS(String phoneNumber, String message)
    {        
        PendingIntent pi = PendingIntent.getActivity(this, 0,

 new Intent(this, SMS.class), 0);                
        SmsManager sms = SmsManager.getDefault();
        sms.sendTextMessage(phoneNumber, null, message, pi, null);        
    } 

 Add this permission in manifest file 

<uses-permission android:name="android.permission.SEND_SMS">

2.Using Intent 

Intent sendIntent = new Intent(Intent.ACTION_VIEW);
       sendIntent.putExtra("sms_body", "Content of the SMS goes here..."); 
       sendIntent.setType("vnd.android-dir/mms-sms");
       startActivity(sendIntent); 

You can get more details from the following site

http://mobiforge.com/developing/story/sms-messaging-android