My brother in law has informed me of this fab bit of news today. Apparently you can pair your iPad and iPhone to share 3G so you can access the Internet when you are not connected to wifi. Basically, anywhere you can get 3G on your phone, you can get it on your iPad.
instructions are here
It's really easy to do, it did it today and it works! It involves creating a personal hotspot and pairing using Bluetooth, sounds complex but the instructions are really easy to follow.
Apparently, you can also do it with the hudl, kindle etc.
However, beware if you are on pay as you go on your smartphone, it may cost you a fortune. If you have unlimited data in your monthly contract you are landed!
Hope this helps anyone at all.