Telephone company needs a customer portal for iphone

Hi I would like to make a online customer portal that my customers can log in to to do the following; 1) Pay their bill 2) View their payment History 3) Setup Direct Debit 4) View a graph of their usage by Day 5) View a graph of their spend by product (DSL, Mobile, Fixed Wire) 6) List their 5 most commonly called numbers 7) Update the details of where to email their bill to 8) Turn off paper billing The portal needs to be secure and will need to pull data using XML from our suppliers system. Presentation is important as is understanding what we are trying to acheive here. Lots of other ongoing work to participate in if you are sucessful on this job including a similar portal for electricity so we can view our electricity usage by 30min block across and a graph of the last three bills. . thanks