Dear Eduardo,
Unfortunately Bluetooth on any iDevice is very limited and pairing you iPad with an iPhone over Bluetooth is not possible at the moment.
What you can pair however are any kind of Bluetooth headphones/headsets or your computer. But even when paired to a computer, access is limited only to Sharing your 3G connection with that computer.
You cannot send or receive any files over bluetooth, unless you have a jailbroken iDevice and btstack installed.
For further info on this matter, please visit: http://code.google.com/p/btstack/
Kind regards,
Ronny