[zane.burton]

My BlackBerry 8820 no longer receives MMS messages ever since I updated to 4.5.
I run an unlocked AT&T on T-Mobile.

[Sytner]

Do you have a BlackBerry data plan? Also try a battery pull so that your device re registers on the network as service books may require to be forwarded to your device.

[zane.burton]

I have tried a battery pull already and no, I do not have a data plan.

[Sytner]

Wirelessly posted (8520 (5.0.0.411))

You need a BlackBerry data plan in order to receive MMS.