atlochowski, there are NO SETTINGS that will work on wifi for us, as the problem is that T-Mobile requires us, on their end, to use cellular data when handling the actual downloading of the MMS.

on android, the downloading of the files goes over the cellular data and not your wifi, even when connected to wifi+celldata. on SFOS, it uses wifi to actually download the MMS.

EDIT: i actually dont know if SFOS uses wifi to download MMS or not, i just know that, on the same device with the same provider and the same APN+MMSC+IPv6,
on android: can ALWAYS send/rcv MMS while connected to wifi
on sfos: can NEVER send/rcv MMS while connected to wifi