It is 4G LTE supported CPE wireless gateway which supports download speed up to 150Mbps and upload speed to 50Mbps.
Which you can connect t&t phone directly and call.
It supports following network bands :
4G LTE FDD Band 1/3/7/8/10 (800/900/1800/2100/2600MHz)
4G LTE TDD Band 39/40 (2300/2600MHz)
3G UMTS/WCDMA/DC-HSPA+ 900/2100Mhz
2G GSM/GPRS/EDGE 850/900/1800/1900MHz
Wi-Fi 802.11 b/g/n, up to 32 devices
SNTP, DDNS, DMS, VOIP
HTTP Online Upgrade, Qos, USB Share, UPnP
Supported OS : Windows XP, Win Vista, Win 7, Win 8, Win 10, Apple Mac and Linux
External antenna slot (SMA port).
One ports for WAN and one port for LAN
One Telephone port and power plug
One USB for host sharing
Weight : 0.60kg