does the Nexus S from at&t and T-mobile are all quad-band? because when i read this ( http://en.wikipedia.org/wiki/Nexus_S#Variants ) the Tmobile(i9020t) and at&t(i9020a) have different frequency bands as listed but in the gsm arena specs it is listed having a quad-band. SO my question is does the at&t and tmobile nexus s are quad-band and what is in wikipedia is wrong?

Also does the Nexus S unlocked from at&t will work in the philippines?