Subscribers to a telex service can exchange textual communications and data directly with one another.

电传服务的用户可以相互直接交换文本书信和资料。

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Earlier this year, subscribers in Britain were given the option of downloading footage from "Big Brother", a reality-TV show, in exchange for viewing a promotional video clip.

今年早些时候，英国的用户可以下载真人电视秀“大兄弟”的视频片断，如果他们观看一段宣传广告的话。

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Revenues grew by 20% despite higher growth in subscribers due to negative exchange rate effects. 2012 was a stellar year for DirecTV in terms of Latin American expansion, and the company believes that its good run will continue in 2013 as well.

FORBES: Can Latin America Help DirecTV's Stock Samba Higher?

Vodafone is also running several pilots, says Richard Saggers, the head of its mobile advertising unit, in which subscribers receive free content in exchange for viewing ads.

ECONOMIST: Mobile advertising

However, the firm has provided an online postcode checking facility for its subscribers to check if their local exchange has been flagged as having an issue.

BBC: Sky logo