Can't receive pics message on BB Storm

[1hank1]

When someone sends me a picture message, I get a note saying, " Someone has sent you a picture message......log into www.some web site.com......pass code is..." Why can I not just receive the message??

One phone was an Alltel phone. Samsung Hue, I think, but is now on the Verizon network.

The other phone is an Iphone on the AT&T network.

What gives?