Sprint iphone 5 picture messages

I have the iPhone 5 for sprint and I'm havih trouble sending pictures mms/SMS to anyone I text. They keep failing and won't send. I send regular messages just fine but the pictures won't go through. Is there something wrong with iPhone 5? My friend has iPhone 4S with sprint and sends pictures without a problem. Don't want to hear how sprint sucks or stuff like that etc. Just want to know if anyone knows what I can do to fix sending pictures and I do have my mms messaging on and group messaging on.

Check your coverage map and see if your service is strong enough in your area. Next I would call Sprint customer service.