The vision link was originally your internet browser's homepage I think. But you said it was a dailer #, here's the scoop from the userguide page 7-8:
*4 [then phone icon] to check minute usage and account balance.
*3 to make a payment.
*7 to add a new line of service, upgrade your phone, purchase accessories, or access other account services.
*2 to access a summary of your Sprint service plan or get answers to other questions.
Sprint 411 gives you access to a variety of services and information, including residential, business, and government listings; movie listings or showtimes;
driving directions, restaurant reservations, and major local event information. You can get up to three pieces of information per call, and the operator can automatically connect your call at no additional charge. There is a per-call charge to use Sprint 411, and you will be billed for airtime.
Tap 4 1 1
and finally to get the operator tap 0 then [phone]