Group messaging not working on jailbroken iPhone 4?

I have an iPhone 4 that is unlocked to work on T-Mobile and jailbroken. A friend of mine has been trying to start a group message and for some reason, it isn't working. I went in my settings to make sure group messaging was turned on, and it was. I'm almost positive I've done group messages before with my dad and sister. My dad has a jailbroken iPhone 4 that runs on Verizon and my sister has one that runs on Sprint and it worked fine. Can someone tell me how to get it to work this time?

Hkvvhk

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