Nokia MD4 Ultra Portable Speakers Connectivity - Wireless Radio GSM 850 / 900 / 1800 / 1900 MHz UMTS 850 / 900 / 1700 / 1900 / 2100 MHz Compatible Carrier & Service AT&T, AT&T 3G, T-Mobile, T-Mobile 3G, Rogers, Fido 3G AT&T 3G or T-Mobile 3G Only Wi-Fi Support IEEE802.11b/g/n Data transfer GPRS, EDGE, HSDPA, Wi-Fi Function GPS Integrated A-GPS support; Ovi Maps 3.0