Wirelessly posted (BlackBerry8700/4.1.0 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/100)

Anyone know what "reject anonymous" and "reject advertisement" options actually do?

Read the manual, page 119.

BlackBerry 8700 User Guide

Wirelessly posted (BlackBerry8700/4.1.0 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/100)

Perhaps you could tell us what it says? The link isn't working from my bb.

Basically, it's a way to filter "unwanted" MMS messages.

The manual doesn't really give good definitions that I could find. On P.119, it says the following:

Can I filter unwanted MMS messages?
Yes. In the device options, click MMS. In the Message Filtering section, select the Reject Anonymous Messages check box or the Reject Advertisements check box.

Not too helpful.

Wirelessly posted (BlackBerry8700/4.1.0 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/100)

Make you wonder how they determine what's "unwanted"?

The determine whether it's unwanted by the juicyness of the MMS. Ya know...nakey pics, embarrasing messages. the good stuff