Device Compatibility; In-Home Wiring - AT&T WF721 User Manual

remain on (no LEDs are lit) once unplugged from the wall power
outlet, then the battery needs to be replaced.
It is recommended that you test your backup battery charge at
least once per year and replace if necessary.
To order a replacement battery and for cost and warranty
information, visit att.com and search WF721 battery.

Device compatibility

The Wireless Home Phone device is not compatible with data
or messaging services, home security systems, fax service,
medical alert systems, medical monitoring systems, credit
card machines, IP/PBX Phone systems, or dial-up Internet
service. May not be compatible with your DVR/Satellite
systems, please check with your provider. DSL customers
should contact their provider before transferring a phone
number to ensure uninterrupted DSL Internet service.
The Wireless Home Phone device cannot be used to make 500,
700, 900, 976, 0+ collect, operator assisted, or dial-around
calls (e.g. 1010-XXXX).

In-home wiring

Interconnecting to home telephone wiring is not necessary, but
is possible; however, it is not recommended unless you possess
suffi cient knowledge of electrical systems. Use with home
wiring requires the physical disconnection from other services,
including the landline coming into your home. Use of a qualifi ed
licensed electrician is highly recommended. Improper installation
may result in phone equipment damage or even a fi re.
Using your device 17