Some specs are listed here: http://support.t-mobile.com/docs/DOC-4261
They state that it supports 802.11 b/g/n, but 802.11a is not listed. 802.11a uses the 5 GHz spectrum, so the lack of that support on the tech sheet likely indicates that it also does not support 802.11n running at 5 GHz.
I have a NETGEAR N600 router (model WNDR3700). The HTC One S sees the 2.4 GHz network, but not the 5 GHz network on this router. My other smart phone (HTC Radar 4G) also does not see the 5 GHz network.