These rates are just for data and SMS. Basically, the voice plans for business have have the discounts already (depending on the plan you have of course). My company gets about 20% discount on standard AT&T individual plans. Here is a quick comparison I made of the website, and the discounted voice plans our company gets:
Standard AT&T plan Nation 450 w/Rollover: $39.99; Discounted: $31.99.
Standard AT&T plan Nation 900 w/Rollover: $59.99; Discounted: $47.99.
Add on the $45/mo. 200 SMS. Unlimited Data. Visual Voicemail, you get:
Nation 450 w/Rollover Discounted: $31.99 + $45 = $76.99.
Nation 900 w/Rollover Discounted: $47.99 + $45 = $92.99.
Compare these to the iPhone plans:
Nation 450 w/Rollover w/ 200 SMS & Unlimited Data: $59.99.
Nation 900 w/Rollover w/ 200 SMS & Unlimited Data: $79.99.
The business plans proposed today are lousy in these cases. However, let's compare this with the other end of the spectrum... i.e. the higher minutes.
Standard AT&T plan Nation 4000 w/Rollover: $149.99; Discounted: $119.99.
Standard AT&T plan Nation 6000 w/Rollover: $199.99; Discounted: $159.99.
Add on the $45/mo. 200 SMS. Unlimited Data. Visual Voicemail, you get:
Nation 4000 w/Rollover Discounted: $119.99 + $45 = $164.99.
Nation 6000 w/Rollover Discounted: $159.99 + $45 = $204.99.
Compare these to the iPhone plans:
Nation 4000 w/Rollover w/ 200 SMS & Unlimited Data: $169.99.
Nation 6000 w/Rollover w/ 200 SMS & Unlimited Data: $219.99.
There are some savings for higher voice plans, but negligible.
Unless of course, I am just reading this all wrong. It could be that the data rates are an option for business users, but they can enjoy the discounted voice rates without the data plan AND they can choose that option.
The additional $10 for 1500 SMSs and another $10 for Unlimited SMSs are exactly the same increments as the regular iPhone plans anyways, so that has a zero net effect.
Personally, I think these so called "discounted" rates are a ripoff by AT&T!