We used this device when we lived in an area where we couldn't get cable internet. We found a much more affordable package using this device. Able to connect all of our computers phones, tablets, TV, etc. to this device.

SPECIFICS:
Voicemail, Caller Number ID, Call Waiting, Call Forwarding, and Three-Way Calling / 3000 mAh Battery

Works perfectly with other carriers as long as bands are supported by the carrier. (It is Unlocked)
The AT&T Wireless Internet provides phone service and Internet access throughout your home. Connect your existing cordless or corded home phones; there’s no need for a wall jack. The device offers all the calling features you expect from your home phone: Voicemail, Caller Number ID, Call Waiting, Call Forwarding, and Three-Way Calling. Get online with multiple Wi-Fi enabled devices to connect tablets, smartphones, and computers. Customize your settings, keep tabs on data usage, and more with the convenient AT&T Wireless Internet Manager web interface. And the device’s 3,000 mAh backup battery can keep you chatting and browsing even in the event of a power outage.

100 % original with all accessories
4G: LTE 2, 4, 5, 12, 29, 30
3G: UMTS 850/1900

ZTE MF279 Technical Specifications:
Type Wireless Home Phone
Form Factor Wireless Home Phone
Height 6.3"
Width 6.3"
Depth 1.3"
Weight 15.87 Oz
Color Paramount Black
Capacity 3000 mAh
Talk Time* Up to 2.5 Hours
Standby Time* Up to 1.125 Days
Chipset MDM92503
Wi-Fi 802.11 a/b/g/n/ac
VoLTE Enabled
Frequencies
3G: UMTS 850/1900,
4G:LTE 2, 4, 5, 12, 29, 30
Text Telephone (TTY) Compatibility: yes

1pc Battery
1pc US Type Adapter