Android OS provide android.telephony.SmsManager, to manages SMS operations such as sending data, text, and pdu SMS messages. Get this object by calling the static method SmsManager.getDefault(). Here is a example to send SMS sing android.telephony.SmsManager.

Modify main.xml to have two EditText for user to enter phone number and text.
main code, AndroidSMS.java
Modify AndroidManifest.xml to grant permission of "android.permission.SEND_SMS".
Download the files.
Related Articles:
- Send SMS using Intent.ACTION_SENDTO
- Send SMS in Alarm Service at a pre-defined time

Modify main.xml to have two EditText for user to enter phone number and text.
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Enter Phone Number:"
/>
android:id="@+id/smsnumber"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:inputType="phone"
/>
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Enter Phone SMS Text:"
/>
android:id="@+id/smstext"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
android:id="@+id/sendsms"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text=" Send SMS "
/>
main code, AndroidSMS.java
package com.exercise.AndroidSMS;
import android.app.Activity;
import android.os.Bundle;
import android.telephony.SmsManager;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class AndroidSMS extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final EditText edittextSmsNumber = (EditText)findViewById(R.id.smsnumber);
final EditText edittextSmsText = (EditText)findViewById(R.id.smstext);
Button buttonSendSms = (Button)findViewById(R.id.sendsms);
buttonSendSms.setOnClickListener(new Button.OnClickListener(){
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
SmsManager smsManager = SmsManager.getDefault();
String smsNumber = edittextSmsNumber.getText().toString();
String smsText = edittextSmsText.getText().toString();
smsManager.sendTextMessage(smsNumber, null, smsText, null, null);
}});
}
}
Modify AndroidManifest.xml to grant permission of "android.permission.SEND_SMS".
package="com.exercise.AndroidSMS"
android:versionCode="1"
android:versionName="1.0">
android:label="@string/app_name">
Related Articles:
- Send SMS using Intent.ACTION_SENDTO
- Send SMS in Alarm Service at a pre-defined time