I'm confused about the plan Cingular has for T600. Couldn't find anything on their website...until I checked Business Solution. Is this for regular consumers?

I'm already a Cingular customer with a National GSM plan (with Nokia 6340) and Text Messaging. Once I get my T600, I was going to swap out the SIM card from my phone to T600, and use it to check e-mails and browse web reguarly. Any recommendations?