I'm having some problems with MMS. I can send and receive MMSs to myself. I can also send MMS messages to an email address. But when I try to send an MMS to another phone number, it just goes about 90% of the way on the progress bar and then hangs and never sends the message. When other people try to send me MMS messages it just appears as a blank space with the blue arrow next to it. Any ideas why this could be happening? It's a software issue for sure, since when I recently restored my iPhone and didn't restore the settings it started working again. But now it's stopped working. I'm using an iPhone 3GS on 3.1.2 jailbroken with blackra1n.