参与者把自己的电话使用频率平均低估了20%，将通话时长平均高估了40%。

Participants underestimated the number of calls they had made by an average of about 20%, and overestimated call duration by 40%.

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此外，资费包中的通话时长不仅在捷克境内可以使用，在国外也同样可以使用。

Moreover, minutes within the package can also be used abroad, not only in the Czech Republic.

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你每一次使用手机通话时，通信服务运营商都会知晓你的通话对方、通话时长和手机型号。

Each time you make a cell-phone call, your network provider knows whom you're calling, for how long, and what device you're using.

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