We called a line with a test tone and started covering up the phone (note, we cannot be sure this line is toll free, but we risked it).

我们用测试语气拨打了一个号码然后开始覆盖住手机(PS：我们不确定那个电话是免费的，但是我们还是冒险了)。

youdao

Patients monitor themselves daily and call a toll-free telephone line to answer some simple questions about weight gain, swelling and breathing difficulties.

患者每天自行监测，可拨打免费电话就简单问题咨询，如体重增加，水肿和呼吸困难。

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Make a reservation for your next trip on-line or call us toll-free. We look forward to having you as our guest soon.

在下次旅行中，您可以在网上或者拨打我们的免费服务热线来完成您的预定，我们真诚期待您的光临。

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An excellent shopping website has no need for a toll free line.

FORBES: All Online Retailers are Not Created Equal

Although Super Blue Stuff is sold in 365 small independent stores and through a 200-person direct-sales force, a majority of its sales come over the toll-free line McClung broadcasts on his infomercials.

FORBES: Blue Streak

Novak, 50, still fumes when he recalls answering a call on Taco Bell's toll-free complaint line in early 2001.

FORBES: Magazine Article