Data Unlimited for iPhone on 4G LTE without Visual Voicemail--WHAT?

I'm trying to pre-order the iPhone 5 on AT&T and I'm getting two data plans. One is "Data Unlimited for iPhone on 4G LTE without Visual Voicemail" and the other is "Data Unlimited for iPhone on 4G LTE". Both of them are $30 a month.

Is this just a glitch or what?