US SIM/Phone card question

A good friend of mine will be going to the US in the summer for about 8 weeks - using his iPhone on a Danish subscription will cost him just over $3.5 per MB, so that is out of the question.

If the phone is unlocked I assume that buying a “pay as you go”-SIM will be no problem - but are there anyone that also includes good data prices? Recommendations?

Since it’s a Danish iPhone, tethering is turned on and available through the Settings menu - will that still work on an US SIM?

Nope. I think he is boned.

heh. Thanks!