As it turn out, HTC HD2 has a built-in WiFi 802.11n, but its support is for some reason was disabled.
Let us remind that the process of the development of this technology took around 7 years, and in September this year, the Institute of Electrical and Electronics Engineers (IEEE) has finally approved the final version of the newest wireless standard WiFi 802.11n which is now used on the smartphone.
Despite the fact that the largest producers of integrated circuits for communication devices Broadcom, Atheros and Qualcomm have developed their own chipset of 802.11n, phones with full support of the new standard are hard to find on sale. It is worth noting that the first devices to support pre-standard versions have appeared on the market quite a long time ago.