European Freerunner in USA?

[joakim at verona.se]

I'm going to travel to the USA next month from Sweden. I will be in San
Fransisco and Vegas.

I would like to use my Freerunner as much as possible as a phone, so I
have some questions:
- Will gsm roaming with Telenor(Vodaphone) work well, or should I buy a
temporary card in the states?
- I have Huawei E220 and E270 3g (HSUPA) modems, do they work well in
the states? How much will a temporary flat rate 3g card cost?


-- 
Joakim Verona