Why won't my iPhone 4s send/receive MMS?

I have an iPhone 4s and has 5.1.1 software. It is jailbroken, but it used to send/receive pictures before. I already tried restarting and turning on and off the MMS option. What else should I do? Do you think it has to do with it being jailbroken?

Turn off the phone and turn it back on. Mine did that when it had service yet wasn't connected to 4g. If you don't see the 4g symbol, you're not on the 4g network and your pictures will not send. Restarting my phone helped me.

Turn on cellular data in the settings.

Software got some wrong send repair

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