No more Picture messaging :(

[Beep88]

The phone is now pre-loaded with UK T-Mobile MMS settings. That's why you can't send MMS. Either manually input the settings (which you can search online), or use official SE website and select any recent phone model, or create and load your own mini custpack by editing existing US T-mobile custpack for other phones.

Or use T-Mobile configurator and select any new SE model
T-Mobile Wireless Data Configurator