Good luck. Apple did not break the law in any way shape or form.
I wouldn't be so sure about that. The ASA are investigating them right now and based on my understanding of Advertising Law (an area where I have some experience) they are very much breaking the law in the EU.
And when it will be on sale from Friday in the shop, you can be sure that, if you ask, the Apple genius will tell you that no, you can not conect in the UK to a non existing network but yes, you CAN conect to a far faster network then the US 4G.
The whole point is, you shouldn't have to ask.
Most people in the UK have heard of 4G and know it is coming. By extension, when purchasing a product advertising itself as "4G", you might reasonably expect it to support the upcoming 4G Networks that all the Network operators are banging on about.
In the EU, you can't imply one thing and then cover yourself by putting a fuller explanation/caveat in the small print.
So far as the ASA is concerned, Apple's content might as well say:
Cookies - 90% Fat Free & Super Tasty
10% Anthrax - Do not ingest.