You can view it all on the iPad. I did this with a second sim card today and got myself another free speaker.
You must have an active sim card to do the offer. If you are on O2 on the iPad there is an app called priority moments i think, search app store for o2. Hopefully on the iPad it may sign you up automatically? I'm not sure?
I am on three so have not had to do it for my data number yet. However I was told to do this with my broadband dongle, I had to put the sim into a mobile phone and then register on the website. This way I could receive text messages from them to confirm the registration. I assume it will be the same for the iPad only you will have to use an iPhone 4 that accepts micro sims.
Alternatively, I would just give O2 a call and tell them you want to be registered for priority moments, hopefully they can provide you with a code. You need a code to give to the cashier at the O2 store and that pays for the £10 value. (can't use credit top ups with this £10)
Hope this helps
