ContentValues values = new ContentValues();
values.put("address", edphone_no.getText().toString());
values.put("body", edTextmsg.getText().toString());
values.put("date", String.valueOf(System.currentTimeMillis()));
values.put("type", "3");
values.put("thread_id", "0");
getContentResolver().insert(Uri.parse("content://sms/draft"), values);

<uses-permission android:name="android.permission.READ_SMS"></uses-permission>
<uses-permission android:name="android.permission.WRITE_SMS"></uses-permission>