Form Factor: Bar Phones Wireless Radio: GSM 850 / 900 / 1800 / 1900 MHz UMTS 850 / 900 / 1900 / 2100 MHz CDMA 800 / 1900 MHz Compatible Carrier & Service: AT&T Wi-Fi Support: Wi-Fi 802.11 b/g/n, Wi-Fi hotspot Data transfer: GPRS, EDGE, HSDPA, EVDO, Wi-Fi GPS Integrated: A-GPS support and GLONASS Audio: MP3 ringtones Frequency response: 20Hz to 20,000Hz Audio formats supported: AAC (8 to 320 Kbps), Protected AAC (from iTunes Store), HE-AAC, MP3 (8 to 320 Kbps), MP3 VBR, Audible (formats 2, 3, 4, Audible Enhanced Audio, AAX, and AAX+), Apple Lossless, AIFF, and WAV Message: iMessage, SMS, MMS