Has anyone tried skype out? I made the first free call & it sounded great! #1 i see conflicting stories, does this work (skype out) only on wifi? #2 has anyone lowered their AT&T (or other carrier) minutes & just used skype out? #3 how many minutes does $10 in skype out credits get me? i've looked on their site, but could not find.....i will only be calling local & within the US #about 3 times per month i call Japan... is it cheaper to call Japan with skype out or just buy a calling card?