Originally Posted by John Clark
That is correct. You can't use the GSM portion of an 8830 in the US or Canada or Mexico.
Just to add, the reason is because the US/CA and Mexico use different bands than the radio provides. The US uses 850 and 1900 MHz. The rest of the world uses 900 and 1800 MHz Bands. Since your phone only has the latter, it has no capability to work in North America.