I'm going to US in about a month and would like to use my SGS for data/calls and GPS there.
1) Any changes that NEED to be made,
2) Changes that would be GOOD TO HAVE, but not necessary and
3) If you have any personal experience with NAVIGATION APPs in US (I have an oldish TomTom with US map, so SGS would only really be as a backup option).
ps. Phone specs in the signature are current