Junk characters? method sendMultipartTextMessage only send text message. If you want to send non text message, you should look to method sendDataMessage. Below is the code excerpt from android cts. It has example on how to send long messages.
SmsManager sm = SmsManager.getDefault();
ArrayList<String> parts =sm.divideMessage(LONG_TEXT);
int numParts = parts.size();
ArrayList<PendingIntent> sentIntents = new ArrayList<PendingIntent>();
ArrayList<PendingIntent> deliveryIntents = new ArrayList<PendingIntent>();
for (int i = 0; i < numParts; i++) {
sentIntents.add(PendingIntent.getBroadcast(getContext(), 0, mSendIntent, 0));
deliveryIntents.add(PendingIntent.getBroadcast(getContext(), 0, mDeliveryIntent, 0));
}
sm.sendMultiPartTextMessage(mDestAddr,null, parts, sentIntents, deliveryIntents)
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