From Forum Nokia Wiki

ID	KIJ000584	Creation date	February 22, 2007
Platform	S60 3rd Edition	Devices
Category	Java	Subcategory	Wireless Messaging API

Keywords (APIs, classes, methods, functions):

Overview

In some cases (see detailed description) Java MMSs sent from Series 40 devices are discarded by S60 devices.

Description

Java MMSs with no priority or normal priority are discarded by S60 devices.

How to reproduce

Send a Java MMS (without priority or with normal priority) from a Series 40 device to an S60 3rd Edition device.

Solution

The workaround for this problem is to always set the priority of the Java MMS sent from a Series 40 device to either high or low.
This problem is corrected in S60 3rd Edition, FP1.