>I am moving to the US next month and am wondering which network carrier
>to use. I want to be able to basically change my phone when I want.
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This carrier does not use SIM cards.
The only GSM service you will find in the United States is 850/1900.
The 900 and 1800 bands are used for something else here. This carrier
does run some GSM service in both the 850 and 1900 bands (like
Cingular), and mainly for Cingular and T-Mobile. You cannot subscribe
to GSM service through this carrier.
For best results, you would want a quad band phone with either Cingular
or T-Mobile.
TH