Android add MMS to database

I want to add some MMS messages into my device database.

I've the following code but it doesn't work at all. No entry are added into the native app...

public static Uri insert(Context context, String[] to, String subject, Uri messageUri)
{
    try
    {
        Uri destUri = Uri.parse("content://mms/sent");

        // Get thread id
        Set<String> recipients = new HashSet<String>();
        recipients.addAll(Arrays.asList(to));
        long thread_id = getOrCreateThreadId(context, recipients);
        Log.e(">>>>>>>", "Thread ID is " + thread_id);

        // Create a dummy sms
        ContentValues dummyValues = new ContentValues();
        dummyValues.put("thread_id", thread_id);
        dummyValues.put("body", "Dummy SMS body.");
        Uri dummySms = context.getContentResolver().insert(Uri.parse("content://sms/sent"), dummyValues);

        // Create a new message entry
        ContentValues mmsValues = new ContentValues();
        mmsValues.put("thread_id", thread_id);
        mmsValues.put("date", System.currentTimeMillis()/1000);
        mmsValues.put("ct_t", "application/vnd.wap.multipart.related");
        mmsValues.put("read", "1");
        mmsValues.put("sub", subject);

        // Create part
        long dummyId = System.currentTimeMillis();
        createPart(context, dummyId, imageBytes);

        // Insert message
        Uri res = context.getContentResolver().insert(destUri, mmsValues);
        String messageId = res.getLastPathSegment().trim();
        Log.e(">>>>>>>", "Message saved as " + res);

        // Update part
        ContentValues updateValues = new ContentValues();
        updateValues.put("mid", messageId);
        Uri updateUri = Uri.parse("content://mms/" + dummyId + "/part");
        int mmsPartRows = context.getContentResolver().update(updateUri, updateValues, null, null);
        Log.e(">>>>>>>", "Part rows " + mmsPartRows);