I recently had to update my iPhone's software so unfortunately I had to basically start from scratch. I backed up everything on my phone using the backup option in iTunes before I updated. Updating from Apple took forever but it completed without a hitch. I then jailbroke the phone with Absinthe 2.0.4. Now I can't send or receive any MMS messages. I've checked the message settings and MMS is enabled. What else can I do? I am using H2O Wireless for service which runs on AT&T if that matters. I can provide whatever other information is necessary.

Many thanks.