coming from Europe, I will soon spend 4 weeks in the US, especially in NY and Chicago, partly for business and partly for tourism, and am looking for a SIM card to put into the UMTS USB modem of my Thinkpad laptop, so that I can surf the internet while I'm travelling. Some of the hotels on my trip have complimentary Wifi, but in others it is quite expensive (10-15$/day). It should be easy to set up as a U.S. non-resident, and economical.
I will honor the answer with the most viable and economical solution.
Thanks for any comments.