AT&T 2256 Cordless Phone not recommended

This is a 2.4GHz cordless answering system with 2 handsets, available for about \$100. We tried it out for 2 days and are returning it. It has a terrible hiss. I don't know if it's the spread spectrum technology, interference with my WiFi, or just the phone, but its unacceptable.

Any cordless phone recommendations? I need headphone compatibility, decent range, and good sound quality.