a couple of plan and upgrade questions

I'm looking to find out what would be the price of BIS if I was to set it up right now? (Currently 4 lines on a family plan, 1000 anytime minutes, free nights and weekends, and unlimited domestic txts for everyone) Only adding BIS to one line.
 
Do I have to call Customer Service to add the BIS or is there a way I can do it straight from my device?

On my 8520, I press Manage Internet Email, and it takes me to some upsell website, and it says I can purchase Unlimited Web for $30, it doesn't seem right.
 
I have been looking to do the same thing recently. I have 2 devices and I want to move a prepaid account phone number to a postpaid account so I don't have to keep switching back and forth between the 2 devices.
 
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