Can't receive picture messages on iPhone 5?

I can't receive picture messages over iMessage unless my 4G/LTE is on and I can only send picture messages over iMessage as well. I can't send or receive over MMS. Oh, and even if I'm using iMessage over wifi, I can't receive picture messages. It MUST be 4G/LTE. Any solutions?

Mine is like this as well, I just assumed I could only do it over my phones data. Now thinking about it I dont have an iMessage account set up on my iPhone, maybe check to make sure that is set up? With your email and everything because I know I used to be able to on my iPod.