AT&T Launches Wireless POTS Replacement Service → Re: Drop Fit Replacement?

Unsupported services
AT&T Wireless Home Phone may not be compatible with all services including home security systems, fax machines, dial-up internet service, DVR services, medical alert services (e.g. Life Alert), or credit card machines. The service cannot be used to make 500, 700, 900, 976, 0+ collect, operator assisted, or dial around calls (e.g., 1010-XXXX).

And assuredly won't work without power.

Battery Capacity: Ni-MH 1500mAh
Stand-by Time:
Up to 36 hours
Talk Time:
3.5 hours (GSM)
1.5 hours (WCDMA)

The only phones I have in my house are cordless anyway. The base is already plugged into my home UPS system. Just like my BB router.