VTech tz 2551
Almost every state has a free, opt-in "do not call" service, which renders moot the primary feature of the VTech TZ2551 cordless phone system. The phone offers a digital-spread-spectrum cordless phone with a built-in, three-mailbox digital answering machine in the base station, but it's hard to overlook its many flaws.
This phone's main selling point is the TeleZapper feature. TeleZapper emits a signal that tells predictive-dialing computers (which just dial numbers sequentially until someone answers) that your number is disconnected. Since our test lines are doubly protected by both the New York "do not call" list and by caller ID blocking, we could not test TeleZapper's effectiveness. Regardless, TeleZapper is more gravy than it is a reason to buy this model.